I've always felt the same as you, and I'm a little bit older.
To be honest, and without sounding like a complete hippy, life is far too short to worry about such things. If you don't fancy anyone, don't get a girlfriend. It's as simple as that. It might get you down sometimes, knowing that most other people seem to have a different outlook - but the important thing is to do whatever makes you feel the most happy and comfortable, you shouldn't spend a single second of life worry about doing something (or not doing something in your case) because you're a bit different - the fact that you're different, and have a different outlook on life, is what makes you interesting.
Noone eats eggs if they don't like eggs.