youngprer,
My general view on fighting is to do what you can to avoid it, within reason. Sometimes you have to fight, but most times you don't. Without knowing the details, it's hard to offer specific advice. If there is an adult around that you can confide in, it may be worth your while to seek some more personal guidance. Judging from your other posts, you're a very mature 13 year old, I'm sure you'll make the right decision.
When I look back on my childhood, there are a lot of stupid things I wish I never did. Then again, there are a lot of stupid things I did that I would love to do again
.
Michael