When I wasn't out, I used the excuse "I just don't

" - it stops people dead in their tracks and doesn't arise any suspicions. If you say you're too busy with school or work or whatever, people will instantly be like "he's probably gay." Trust me, you never have as much free time as you do when you're in high school or University. Just say you don't because you just don't. Maybe you have no game, maybe there are no girls at your school that you like, maybe the girl you like is in a relationship, maybe the girl you like doesn't like you back. Saying "I just don't" could mean N-E-thing.