hi, i had same problem as urs since i was 16. these ware things u may consider:-
1. cut ur hair short
2. use organic shampoo which mainly design for hair loss control/ thinning hair
3. take ur meal in nutritious balance
4. exercises regulary (3times a week)--- ur scalp doesn't hav enough oxegen to reach if u x exercise
5. supplement- biotin, vitamin b-complex, viviscal
6. apply natural/organic hair tonic (may consider FDA approved product---> minoxidil 2%)

i hope the above information help u out =)

Thanks =)