Your brother is bullying you though. And bully's usually do what they do because there jealous or insecure themselves. talking to your brother i think won't do much and ignoring him seems hard. This site might make you understand why your brother does it and give you advise on how you can stop him.

But like any other bully you need to take him down and i don't mean retaliate. You should never do that because it can cause you to get more hurt. You need to get your mum to listen to you and that your brother is telling you to go kill your self and that if she doesn't help you might want to consider ringing Kids' Helpline at 716-834-1144 or on their toll free line at 1(877)KIDS-400.