It's the old "trying too hard" thing. The very best thing you can do for yourself (who is the only one you have any say over) is to do exactly what you've said: focus on yourself and the things you enjoy. When you do that, you become magnetic...not just for girls who may want to kiss you, etc., but to people in general. I think you will like the results.
BTW, I am a female who didn't have her first kiss until 24. It does kinda suck when you're young and you feel like the only one left out, but looking back I wouldn't have had it any other way.
Be you, have fun, engage in your life to the fullest extent and reap the benefits, relationship and otherwise.