you have to train your mind to stay on the positive track; you have to stop when you find yourself resorting to old patterns of thinking and doing. you have to be open and see the world in a different light. you want to change, so that's your first step.
dont be a pessimistic, it just make you hate yourself. why they hating you? if they dont like you it's their problem!
First listen to the Whitney Houston song "The greatest Love of All ". N then memorize the words n say them every day. Learning to love urself is the greatest love of all. Then everyone else loves u