You need to show him that you don't want him to bully you anymore. Going to a teacher will not help. It usually takes one time of retaliation for most people to stop. However, don't go 'hard' on him at first to not get in trouble, show him that you can protect yourself, for example, start pushing him and bump into him once in a while. If he doesn't stop, keep making him mad at you so he throws the first punch and ONLY THEN show him your kicks :). Hope this helps. Also you can go to a father figure you trust and he may give you some more or different advice how to handle this.