i need 更多 advice...

I would ignore them and stick ur tongue at out at them. Sorry im rly immature xD

If they say 'here comes ugly' all 你 need to say is, 'well obviously i'm not that bad as 你 can't see yourself' 或者 'looking in the mirror again are you?'
Short, snappy responses will put them off their guard.

Also i would go speak to a teacher 或者 the headmistress/master 或者 a peer 你 trust and get their advice. Ask them to make the bullying stop.
If they don't and 你 feel your life is threatened, physically 或者 mentally, then i should start 写作 everything the bullies say and do to 你 in a booklet. Once you've got enough, go to the police and file for a restaining order, then go get a solictitor (lawyer) and see if 你 have any grounds to sue your school for negligence.

Stare them in the eye with a blank face for long periods of time, it'll creep them out.

Dont get mad coz you'll be giving them the satisfaction.just toss your hair-and if i were 你 i'd be tempted to add on that they arent exactly goddesses themselves-trust me,showing them 你 dont care takes the thrill out of the whole USA bit and they'll stop.