You will always be "scared" in life when you are faced with a new and unfamiliar situation. The seniors will have too much to worry about to be bothered wasting time hating or hassling you. They will have senioritis, be worried about college essay exams, and requirements, and they're so ready to be done that your existance won't matter that much. Many juniors may be the same way. They probably have better things to do than make your life miserable. I might say watch out for the sophomores, but chances are as long as you are nice and friendly to everybody and you don't participate in gossip or other social faux paus you will make friends and will come out unscathed. Try to get involved in at least one sport, club, or school activity; you will make friends and you'll have something to do besides homework. Try to get on the goodside of at least one teacher. It may not seem like it, but having a teacher who thinks you're a good kid can help you out in ways you might not even think of. Also, remember if you need help or advice your teachers and your guidance department are always there to help you.
--From a High school teacher.