revenge by those who have made me disappointed

I hate them all,,although they have made me different,,,but they have made me disappointed ...what they did was not too perfect, and too often makes me broke my heart,,,,
I'll do anything to make them feel the pain in his own disappointed by FRIENDS .......vengeance I want to do, not by physical but with a mental way, by destroying their mentality, they will feel what I feel at this moment ...
but I did not injure them now ..I'll do it when they are weak mentally ...which I do now is find out how far their mental abilities