18 and possibly losing hair

[jqf1]

Hello guys,
I am 18 and am worried that I am starting to lose my hair. My maternal grandfather had a full head of hair. My father has a full head of hair but my paternal grandfather is bald. I started to notice that my left temple has been a little bit thinner. I think it is receding faster than the right temple. Im not sure if this is due to early mpb, a mature hairline, or the extreme fade haircut I get. I recently started to notice something weird on the back of the crown of my head. I went to two doctors and they said its probably nothing to worry about.
Any input would help,
thank you

[mrclean]

Do you have any before pictures? If not can't make a judgement.