I have thinning hair. I'm only a 29 her old female.

i first noticed my hair thinning at age 27. I've been to a few different doctors. They all said it's genetic. My parent dont have thinning hair or grandparents. But i have Been searching online and i don't eat proper, like veggies or fruit. I always had my hair in pony tails or buns, tight. I've dyed my hair alot. The doctors did tests and everything was normal. I'm also on the depo shot. I read about people on it and they get thinning hair..but the doctors told me no on everything.