Okay so I have not seen a doctor about this because I'm only 14 but I think I may have Multiple Personality Disorder or Bipolar Disorder or something close to that. I think that I have MPD because sometimes I think I'm a guy, you know typical hot guy that all the girls want(ps I'm a girl), then I feel normal like a girl again. I think I'm Bipolar because everyday, I have drastic mood shifts and changes over the smallest things. I just go into complete white hot rage. Then I feel so depressed and hopeless right after. I know I can't be fully diagnosed online but what do you think? Also when a person has MPD, can one of their personalities have symptoms of a psychopath while their normal self is well normal?

Sounds like more normal raging Teen hormones, but you MUST see a professional about your concerns.
No one can diagnose you over the internet.

MPD is EXTREMELY rare and usually caused by emotional/mental/physical trauma. So I doubt you have that.

It sounds like you are a typical teen with typical teen hormone issues.

You sound like me when I was 14.

If you are really concerned, please see a doctor or therapist for real-time help. Be careful not to label yourself. You have a lot of living to do.