no its not stupid
your just feeling guilty, and your lucky that youve got people who will miss you, and youll see them when you get back
your sister sounds like a sweetie, and im sure shed love getting letters and calls from you from the other side of the world
and i think your best friend is being a bit selfish, she must know that this is something youve always wanted to do, so just assure her that your just a phone call or an email away
and dont worry about american customs(unless you havent got a passport lol)
and your friends will miss you but youll probably love the experience and make new friends and have lots of fun, and its not like youll never see them again
have fun in the states!!! and dont worry
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