Why do I change personalities all the time?

You should NEVER bottle up your emotions like this! You are probably screaming and cutting yourself because of this feeling you have. Sometimes I get this feeling to and i just want to hurt whatever is around (normally myself). I am very much like you. I don't like telling people my true feeling as i am scared and shy and I'm not sure why. I hate it when my friends say they understand but they really don't. What i do is just scream in a pillow. Naturally I am a happy person but sometimes i feel like you for reasons i don't want to share. But if you bottle up your feelings who can get very sick. And it is likely you could get a brain tumour or an olsar in your stomach. Scary, I know!