Peer Pressure is by far the hardest thing to escape from in high school, simply because there are so many things that are demanded from you and so many strong influences all around you. The influences range from consuming drugs to changing your flair. The point is that you have to be believe in who you are and not change, even when you feel like you do not fit anywhere.
The goal of freshman year is to find the place where you can be who you are, without changing anything about yourself. It might be easier to change and adjust to fit in but nothing that is easy is worth in the long run.