If they say 'here comes ugly' all आप need to say is, 'well obviously i'm not that bad as आप can't see yourself' या 'looking in the mirror again are you?' Short, snappy responses will put them off their guard.
Also i would go speak to a teacher या the headmistress/master या a peer आप trust and get their advice. Ask them to make the bullying stop. If they don't and आप feel your life is threatened, physically या mentally, then i should start लेखन everything the bullies say and do to आप 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 आप have any grounds to sue your school for negligence.
Dont get mad coz you'll be giving them the satisfaction.just toss your hair-and if i were आप i'd be tempted to add on that they arent exactly goddesses themselves-trust me,showing them आप dont care takes the thrill out of the whole USA bit and they'll stop.