lock yourself in a room that locks from the outside. make sure theres a lifetime supply of vegetables and water in it that way you will never be tempted to be bad ever again! you can contemplate your life in a hermittish fashion and become a great philosopher
what do you fight about. i have four brothers so i might be able to help. every time you want to fight with him ask yourself if its worth him hating you for the rest of his life. hes always going to be your brother
If the fights start because your brother annoys you or frustrates you, then I know it can be hard not to retaliate (I have two younger siblings who fight all the time and get on my nerves), but you need to learn to control your anger. As much as he may make you peeved, he is still your brother. Fighting with him will only cause more problems. It may be difficult, but please TRY being nice, no matter how irritating he gets. Ignore him, and when he's not being a pain, try bonding with him. This will lighten the fights and eventually you will rarely fight and just get along instead. If you feel the anger coming along and can't control it, perhaps shut yourself in your room and just listen to music, or take your anger out on something in your room, play a game, exercise etc. Going for a walk helps as well. This will all take practice, but you'll get there eventually. You're not a bad guy, you clearly have a good heart if you want to change the way you behave toward your brother. Best of luck!
when ever you start to feel angry at your brother here's what you can do to stop: clearly you love him or care about him because your asking this, so just remember everything good he's done for you, and if you can't think about that just think about how he's not a bad brother and there's definitely MUCH worse out there. just try to think about something else, like pink elephants. also what you could do is take a picture of his face, print it out and put it on a pillow or a dummy and whenever your angry, just get up, go the pillow or dummy and beat the sh*t out of it.