Is it normal that i act like two different people?

Becoming who we want to be is an never ending challenge. You are confused and your imagination runs too wild. Slow down a little and try to act like who you are the most instead of getting caught up in the moment all the time. Pick a focus and stick with it no matter what. Its okay if your mood changes just keep that picked personality. If you like to act in the mirror, its okay, maybe you can make a youtube video if you like acting out your multipersonalities. If you don't settle down soon, it can turn into a major problem later on in life. You might need a little bit more maturing as well. If talking in the mirror bothers you that much, then next time you go to the mirror, just look and don't say anything and think to yourself that "talking in the mirror is childish and stupid" and then move along to something else, like focusing on a different hairstyle or make-up applications. This should take your mind off of it for a little bit.

I have the same problem, its like i cant choose who i am inside,so i act in many different ways.Hopefully one day ill know which one i am because its pretty confusing. Maybe im just sad about the past and as i changed my past personalities and attitudes just stayed as i added new ones. But now no one can read me like a book.

em well you stop talking to the mirror?
and you take control of your actions?

you act as if something is forcing you into talking to a mirror when its not