Obsessive thoughts, jealousy, hatred, or dislike for three years?

This is embarrassing so I won't say who the celebrity is, please don't ask. I once loved this singer. Before she became popular I often defended her and wanted the best for her. Then after gaining success I began disliking her. She seemed different; cocky, fake, full of herself. Then to make it worse she got all this attention. And people always ogled about her looks so I began scrutinizing her looks and privately saying and writing VERY mean things. I guess she had the life I wanted and the anger in me grew. To the point I stopped going on certain websites and listening to the radio to avoid her. Reading nice things about her literally makes me depressed. After a while I began the problem was less with her but more with her fans lying about her pretty and perfect she is. When terrible things happened to her I was happy. Its been three years and I do not know how to stop hating this girl. I desperately want to like her or at least not hate her, but I don't know how. Please help me. I am not a bad person. It's just this girl bothers something deep inside me.