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My main issue is the fact that I see them as always moving/serious/busy. How can I overcome this?
Superglue, and lots of it.
OK, seriously, part of the problem is that you are making up excuses. If they weren't always busy/moving/serious, it would be that they must already have a boyfriend or something like that.
You're also putting the women up on a pedestal before you've even talked to them. You don't know who they are, they could be total bitches, racist, unintelligent, etc. You also seem to think that they will punish any guy who tries to talk to them who isn't on the football team.
And you're placing an absurdly heavy weight on the success of the conversation, and conversations with that kind of pressure rarely succeeds.
Like Silverback recommends, just start talking to everybody. Work your way up to HB classmates, and along the way you'll see that for the most part, all you need to do is talk and have some light banter. It's great if you have a super-clever line, but they aren't necessary.
There's an added advantage to being conversational, you start to get a glow where you maintain an upbeat tempo that other people want to be a part of.
I actually prefer daygame because it's a little more direct and honest. Women are actually nicer and more open than the ones you run into at bars and nightclubs. Instead of thinking up a clever line, which is probably more useful in a nightclub, be situational and talk to the woman about whatever she is doing or something that is around her.