Uhoh2020

What would be a preventative measure?

17 yr old male. Hair seems like it is "fluffier" feels lighter. Receding temples and now maybe crown. Barber says it's a cowlick. My mother says she noticed changes in my hair at 15. She has fphl. My dad shaves his head and was thinning in early 30s. Am I really balding so early and is Rogaine a good treatment? Hair is really greasy in last pic... It gets oily faster and my scalp itches a lot.