Fake MPD

So this is a problem I've had for a while. Probably for as long as I can remember, but especially for the past couple years. 

In my head, there is a type of person I want to be. Actually, a bunch of types of people...and they are always conflicting with each other, and with the person that I actually am (whoever that is). Sometimes I want to be positive, optimistic...and sometimes I want to be realistic or cynical. Sometimes I want to be judgmental, and sometimes I want to love everybody and have everybody love me back. Sometimes I want to believe the cliches, and sometimes I want to laugh at how ridiculous they are. 

I will go through months where I want to be a certain type of person, and then realize I don't actually, and then I'm confused about myself and where I am in my life. 

There's people who knew me when I wanted to be a different type of person than the person I wanted to be when I went to university, and then there's people who knew me even before those people, and there's people who knew me in different settings, and all through this time I've been confused about the person I am and want to be...and so essentially I have a bunch of different versions of myself floating around out there, and a bunch of different people who think they know me, but really only know the type of person I wanted to be when I met them and the type of person I wanted to be while we continued to know each other. And I let their perception of me limit the person I am with them. 

Mainly, I just want consistency. I want to know what I want. I want to know who I am, and for other people to know who I am. I honestly don't even really think that people can objectively "be" anything. Maybe this is why I am having this trouble. But I don't want to have to switch personalities when I switch who I'm talking to. I want to be able to follow people's advice when they say "just be yourself" in an interview. 

No idea how to remedy this at all...