Prometheus,

sounds liking your having a hard time settling in. I'm in college now but i went to school in Ireland and can give you some advice if you want. You're being picked on because you're different (you're american) - you have two options really

1 stand up to the bullies yourself

2 tell a teacher (wont be as bad as you think if you tell them everything that went on)

Also are you at a rugby school? if you are playing rugby or taking up another activity may help you fit in. Then again you may not be sporty - but at boarding school i think you need some extra curriclar activities to fit in - do something you like.