Aaron says: Sometimes bullies like to bully the difference right out of us. By doing that, they win. Do you want them to win? We all have parts of ourselves that we'd like to improve, and it's important to change and grow to make those changes.
However, if we're changing because someone else wants us to change, it's probably not such a good thing. Differences are usually good things (wouldn't it be boring if we were all the same?).
Also, there are lots of differences that we can't change. In those cases, it's important to accept and be proud of your differences. Feel pride in them, and don't let the bullies make you believe you should change for them.