I dont know who i am?

I find myself beoming less and less familiar with who i am as a person. I try to adapt different styles and personalities. Im far too impressionable and i'm 20 years old. Some say thats ok, but i feel like i should at ease with being myself around my friends and loved ones. I'm tired of experimenting, i want to feel comfortable in my own person, but i'm not. When and how will this change?!