If its the Battlefront II I think it is, which is a Star Wars game called star wars battlefront II, you have nothing to worry about. I've been playing it a lot since I was eleven, and theres no blood or anything. If your parent or guardian permits that you can play it, it should be fine. It's a great game and its really fun. Besides, a lot of games are rated T for silly reasons. I think Star Wars Battlefront II is only rated T for a little bit of violence, which, well, is in every fighting game, and very mild language.
Just because its rated T doesn't mean it's illegal for you to play it. The rating is basically just a suggestion. Unless a game is rated M, then it's illegal for a teen or kid to buy it. But if its just rated T, ask your parent or guardian about it. Have them read some reviews and stuff online and ask them about maybe getting your own copy. If they say no, well, maybe in the future. If they say yes, great, and you're good to go.
Like I said, if its the Battlefront II I'm familiar with, I don't see any problem with it. But then, it's up to your parent or guardian.