Thinking sexual thoughts about people you know isn't really unusual, I think your virginity is playing on your mind and whether consciously or not you feel the need to lose it. This might be the centre of all your related woes. When it happens, it won't make anything any different. You'll still get frustrated and you'll still think dirty thoughts about people. Take a step back from that. Remember that no one cares about your sexual experiences, or lack of them. You might tell yourself that you're ugly, but even when inebriated, a girl can still choose one guy over another, and if you're getting flirted with then you can't be as hideous as you're telling yourself. I think it is a good idea to try and swap numbers with a girl next time she's throwing herself at you, see what happens.