it makes no sense...why do i have a dry scalp, yet oily hair, limp, flat hair?

Also, my hair is falling out like crazy. I am only in my 20s. And when i look at the long strands of hair that have fallen out, at the tip that was in my head, there is a tiny whitish ball still covering that end tip of the hair. what in the world? it's like it's the folicle or something

im only 20 and im losing them like you. Right now im losing anything from 150-300 a day and alot of them have this white tip-(not dandruff). Does that mean it wont grow back i wonder?