You've had to be strong in the face of an impending storm for quite a while now I imagine. Keeping such a big part of who you entirely to yourself is no easy task in regards to either the necessary secrecy or the self suppression. Thus, considering how long you've been actively undertaking this task - and before I make any other points - I want you to recognize your own strength of self and conscious. Look at all you've gotten through knowing that you are here thanks to yourself. Acknowledging your achievements can only strengthen your self-confidence in the future. Now I want you to take a deep breath in on a five count, hold it for one, and let it out on a ten count. Do this five times.
You are strong. You are evidence of that. Your very presence here on this forum demonstrates that you recognize the various traits of your sexuality, so don't actively worry yourself about who you are. What's more, if labeling or defining your feelings towards the same or opposite sex helps, feel free to do it. However, your feelings come from your most inner self and they often know you better than you do. So don't label yourself as anything you aren't truly feeling. And the other difficult thing about our feelings - our emotions - is that they fluctuate constantly. The core of how we feel remains very stable but a great deal just changes with the wind, don't let this throw you off though. Just because you are attracted to girls one day and guys on the other doesn't mean that you can't be attracted to both. Now I don't want to be redundant and repeat everything that all these caring people have said so I'll keep it simple and tell you my own story...
When I was eleven I had my first acknowledgeable feelings for another guy. I say "acknowledgeable" because before that age I don't really remember being able to name what I was feeling beyond saying "I like so-and-so." He was the same age as me but was never clearly interested in reciprocating my feelings of "like". I was confused because I had been told by society that boys liked girls very clearly, but because of my parents' buddhist-agnosticism I was never told anything at all about the other half of the equation. Ultimately, I pursued my curiosity to our old friend Google and asked what it meant to like other guys. It used to be that the Wikipedia article was one of the results on the first page but that has since changed as has the content of the article, but it named my feelings and gave me context for them and that was what I needed. I knew that there was a large, very vocal community out there of people like me and to this day I take great comfort in that fact.
As a young teenager I was exceedingly stubborn about my "rights" within the household and my opinions on my standing with my parents. But I had by this time, when I was about thirteen, read up on this community to which I belonged and knew that there were horror stories out there. I didn't want to be thrown out of my home or disowned or suffer any other 'punishment' for who I was. So I had stayed quiet. As you know, bottling yourself up for too long is incredibly hard on the bottler. I personally had several nervous breakdowns which, coupled with my ADHD, caused my parents to seek help from my Aunts and Uncles as I and my siblings were among the last children born in the family. One day, in either the spring or perhaps the fall, when the weather was crisp and light as it is on the perfect day that only happens once a season, my parents gave me to my Aunt C. and her daughter K. for a day trip into Philadelphia. K is the oldest child in the family and was already studying pre-med by that point at a university in Philadelphia so she met us at the train station when we arrived. My Uncle M. merely drove us to our local platform so it was just my Aunt C and I on the train for the hour long ride. We mostly talked about unimportant things: school, music, the day ahead of us etc. But there came a point where that part I had been bottling up rebelled against the concept of avoiding who I was with yet another family member for what I had thought could have had to have been the rest of my life. So without thinking I told her there was something very important that I had to tell her. We had both been quiet for about 10 minutes by this point so even my own voice startled me when I spoke, "I think I'm gay." was all that I said. Yet it felt as though I couldn't breathe, I was panicked, not understanding how I managed to say those five words and terrified of their consequences. What she said in response is something I will never forget because before she said a word she started smiling like only an Aunt can, "We've known since you were about three." I almost immediately thought I'd pass out from the overwhelming feelings of relief, happiness, and safety. She went on to tell me that while her husband, her daughter, and she herself had felt that I was gay for all that time, that she had not said anything to my parents, but that she and her family would support me no matter what my parents did, and that they would always love me absolutely, regardless of the future.
I went on to come out in my all boys Catholic middle school, and thereby come out to my parents indirectly as my brother went to the same school at the same time as me. My parents, after mourning the loss of their ideal, first-born son, came to accept me after two years or so. And although what happened in those two years is something never forgotten, I love them none-the-less as they love me. I can't tell you that coming out as I have is the right path for you to take because I don't know the ins and outs of your life. However, I want my story to demonstrate that you will find that there are people who love you regardless of who you are. They are undoubtedly already in your life and would be the first people to come and tell you that they'll be there to support you no matter who you love. Hopefully, and in truth this is fairly common, they may already know and are just waiting for you to share your realization with them. In the end, whatever hurts and pains you suffer from this awful predicament will heal. Your wounds may scar, but remember, Time will always heal them.
I wish you all the luck in the world and lots and lots of love,
RawrRawrRocco <3
P.S. Don't forget to breathe