how does someone recognize themselves?

just to let you know, it will probably have topics like mental health, etc. 

I honestly don't know where to start. I'm an unstable person, too much. It's not always like that, I think. I change my opinions frequently and, sometimes, it's as if I have more than one voice in my head, and none of them shut up. I often find myself in situations where I want to form my opinion/take my position on something but I can't, because it's as if one voice overpowers another, going into a cycle until my mind gets tired.

It's exhausting. 

I don't know who I am. I could say I want to be someone normal, but suddenly that's not what I want anymore. I don't know what I want. and, sometimes, it's like i'll never know. My perception, not just of myself but also of others around me, is constantly changing, and this makes all of my relationships extremely unstable. One moment I can be happy with the person, wish them well and, the next day, they are worth nothing, no emotional value, my mind stopped seeing them with affectionate eyes. and that goes for me too. 

I can think of me as bad person, a good person, or just... nothing at all. Like I'm a second character in my own life. And one thing that makes it worse is the fact that I lie a lot, especially to myself. In moments where I think of myself as good, i change memories to paint myself as the good guy. When I think of myself as bad, my actions turn 300x worse than they actually were, and suddenly it's my fault. and i could feel that so intensely, but, the next hour, i could be feeling nothing/normal again. it's like that didnt even happen. lies are erasing my memories, i dont remember how i felt in many moments of my past. i dont know how i perceive myself anymore.

I don't know how to explain it, I have a lot to say, but I can't put it into words. everything changes very quickly. sometimes not. Maybe it never changed? I don't know. I don't know who I am, and I'm pretty sure this isn't just a "teenage identity crisis." I can feel that there is something wrong with me. 

can it get better somehow? i want to be able to tell someone who i am, how i see myself.