i need আরো 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 আপনি need to say is, 'well obviously i'm not that bad as আপনি can't see yourself' অথবা 'looking in the mirror again are you?'
Short, snappy responses will put them off their guard.

Also i would go speak to a teacher অথবা the headmistress/master অথবা a peer আপনি trust and get their advice. Ask them to make the bullying stop.
If they don't and আপনি feel your life is threatened, physically অথবা mentally, then i should start লেখা everything the bullies say and do to আপনি 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 আপনি 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 আপনি i'd be tempted to add on that they arent exactly goddesses themselves-trust me,showing them আপনি dont care takes the thrill out of the whole USA bit and they'll stop.