Who am I? ..

Everyone says that right now (18yrs old) I don't know who I am and what I want for my future. They're 100% right. I don't know who I am, I have a vague idea of what I want(career wise) but other then that, I have nothing. I am not even sure if green is my favorite color anymore or if it ever even was.

Does everyone go through this at this age? If so, HELP. It's frustrating honestly.