Understanding people: I dont

This is my rant about people. I know I posted today about the great people that have helped me and this post has nothing to do with them. This post has to do with all the people that I don't understand. I have taken a few psychology classes and they have taught me a few things about people. First of all why do we always only care about ourselves? I admit I have done this before because I'm human but, I do care a lot about other people. I get tired of people who disrespect others and cause harm to others. Stupid people also drive me crazy but, more when they are just ignorant. But in trying to understand people I go crazy sometimes. I want to understand some people but, after driving myself crazy I realize I wont understand them. Then the only thing to do it be nice to them and let them continue. This is hard but, necessary sometimes in order to maintain sanity.  I am not exempting myself from this. I realize I probably drive people crazy sometimes because I do weird things sometimes. People are weird.