>>1 anys, i know exactly what you are going through and i get these really violent thoughts about breaking people and hurting them badly too. i don't know exactly how you feel about these thoughts but it sounds like you feel kind of guilty for having them perhaps? or even ashamed? it's ok to be scared of your own thoughts but i think that you shouldn't be.
i don't know if this is going to be helpful but my advice is to just let those thoughts happen and accept them. it's not a really good idea to suppress angry or violent thoughts (at least i think so) and it's best just to let it wash over you when it does happen. i reckon it's ok to THINK about hurting and being angry and violent as long as you don't ACT it out. i think the problem here is that you're not allowing yourself to freely think and feel these things because you think they are wrong and that it's not ok.
well personally, i think you can't be completely 'nice' if you know what i mean. you have to understand that it's ok to think violent things and hate things because that is a normal thing to do. if you just let yourself feel the hate instead of trying to make it go away, i bet you will feel much better.
you just have to make sure you don't act upon those thoughts and feelings and believe in your own self-control. i hope this helps you.
(and no, you don't need anger management ;) )