I'd say that the only conclusion that can really be made at this point is that you are just 18. You'll read here that a lot of guys are virgins into their twenties. Are they shy, repressed or undecided? Only they know or will discover that themselves over time. Like above, just be true to yourself, allow yourself the experience of experimentation. Don't judge yourself and don't take on other people's projected judgements. Remember that other people's opinions are none of your business, i.e., not to be taken into consideration as fact. Just have fun and be safe.