Personality isn't something you can alter in a second like a hair cut or putting on make up on your face to look different.
You shouldn't worry about what other people think of you. If the real you is not accepted by people, why try to please them? In other words, be yourself, as cliche as that sounds.
Trying to please people for the sake of being accepted is hell. I should know, I'm living in a town where I go school and I'm a loner. But I don't try to please people, which is why I stand alone instead of with everyone. You're unique, don't try to alter yourself to fit in because it's not worth it :)