Male Baldness Info

I’m an 18 year old male.I saw a dermatologist and he said I have male pattern baldness.I don’t believe that only 2 people have lost their hair in my family and its my uncles on my moms side.I don’t want to take propecia or Rogaine.The dermatologist and my usual doctor didn’t even give me a thyroid or blood test.So how can they know just by looking at my hair and knowing that 2 people in my gigantic family that I have male pattern baldness.They said I could either take Propecia and Rogaine or get a hair transplant or just watch my hair fallout.I think its best that I start eating healthy and stop eating all junk food including sodas and trying out All Natural and Organic Shampoo and expose my hair more to sunlight and excercise and massasing my scalp 5 minutes a day.