Am I really balding?

Did my dermatologist prescribe Finasteride too liberally ? Context : 27 y/o. Father and his 4 brothers have full heads of hair. Mother’s side : 3 out of 4 bald uncles. They were bald in their early twenties. I went to the derm two weeks ago. He didn’t look closely at me or do a hair count. He was like “yep, looks like MPB alright” and gave me a prescription for Fin (1mg). First pic is Aug 2017. Rest of the pics are from the last 2-3 months.