im used to guys pressuring me into sex and having sex before im ready. I know its stupid but after being a hurt a lot id do it cos i was scared theyd get bored of me n leave. But i dont want to do that this time. I think this guy actually is decent...which is why i dont wanna stuff it up by having sex too early so that it might just become about sex.
In my experience it's not as important to mark off days on the calendar as it is to have some idea of what qualities you are looking for both in a man and in a relationship. In my experience, when a relationship becomes sexual "before it's time" what usually happens is that lovers become over invested in a relationship that doesn't have a great foundation or isn't a good match in the first place. That makes it harder to let go, and winds up with hurt feelings.
Can you look at your previous romantic and sexual relationships and find anything specific that you think made you feel pressured or uncomfortable? What were the things that you think were a good sign that you were ready to take it to the next level, by which I mean to add sex to the relationship? What are your goals? What do you want from a relationship?
For example, one good sign that a relationship isn't ready for sex is a lack of good communication. By that I mean discussions deeper than what's on TV tonight or your favorite youtube videos. He should also show clearly that he respects you as a person. That can be anything from the common courtesy of a phone call instead of a text, to showing an interest in the things that you feel are important. If your goals are a long term relationship, he should be doing things that clearly align with that goal.
If you are thinking along the lines that a relationship should even have some kind of marriage potential, then you should be asking questions more along the lines of "life goals" and plans. That's not to say that he needs to propose before you sleep with him, but you should be thinking "you know if this works out I could see myself with this guy." It might not work out, but at least you'll be starting something deeper with someone you have a good feeling about.
And lastly, not everyone can have sex and not develop feelings. I am one of those people. Sex for me, before marriage, was never "just a fuck". I would never have been able to do a FWB thing because sex for me creates emotional intimacy, and if the other person isn't interested in that then it would have been a disaster in the making. I genuinely liked all of my sexual partners, respected them, and wanted to be emotionally intimate with them as well as physically.
When you discover that nothing is missing from the puzzle, then you'll know that the time is right.
All the best!