Howcome all the cute boys are được ưa chuộng and/or jocks?

Not all the cute boys are được ưa chuộng and/or jocks. A lot are, and it's depressing, but not all of them are.

i always wondered that.

Not all cute boys are được ưa chuộng hoặc jocks.
If you've looked at a group of cute boys, it's just a cheerleader effect (similar-looking people in a group just looking attractive, when really they're not.)
Sometimes they look attractive because they have success and charm.
It also depends on what bạn find attractive: some people just like jocks because they're jocks, some don't.

And that's my explanation :D

because they are not.nerdy boys are cute and are less likely to end up in JAIL