[PICS] I am 18 years old. Am I balding?

[HaloDelta]

I have noticed my hair getting less and less thick, now I can see my scalp through my afro! How do I fix this? It's been happening since I was 16. My uncle is the only one in my family with thin, slowly balding hair. My parents keep telling me not to worry, and a doctor said I'm not balding. My gut says otherwise.