Baldness at the age of 17 only? Please somebody help !?

Hi, I am 17 years old boy and I am suffering from hair loss problem.. actually my problem started 3 years ago because of using hair gels on my hair.. i had very silky, smooth, shiny, and very thick hair and i used to apply hair gel on my hair but after using that dandruff problem started and my hair became very dull and my scalp also became very dry and flaky.. i did not knew much about hair dat time.. last year I started using SELSUN shampoo for dandruff but after using it my hair started falling like hell.. whenever I used to comb or wash my hair they fell more than normal... after that i stop using that shampoo and I consulted a homeopathic doctor to stop hair fall and to get back my lost hair.. it stopped my hair fall after few weeks and i continued my treatment so as to get rid of this problem permanently... but after some month in winter again dandruff problem started.. and i again started using that SELSUN shampoo (actually after using it again i cam to know that because of using this only my hair fall problem was started... before this i did not knew about it..) and after using it again.. my hair fall problem again started and i thought that this homeopathic treatment is of no use because i was taking it from last 10 months... later i came to know that my hair fall problem was due to using this harsh chemical based products like hair gels and shampoos... now i am very dippressed because my forehead very large and my hairlines are receding very badly.. its not a genetic problem because no one is bald in my family history.. this is because of using these products only... i wanna get back my lost hair... because of dandruff my hair roots are blocked and hair are unable to grow.. please somebody suggest me the treatment... i don't wanna use these chemical based products like rogain or propecia because its not a genetic problem... some times i think that why actors who use gels on their hair don't become bald ?? ANY one please suggest me some good treatment to get back my lost hair as i am very young and it is not genetic problem so i am sure that i can get my lost hairs back... i am thinking to try onion juice on my hair.. but after viewing some people's review on it i came to now that after using it baby hair grows but they dont grow.. they remain as usual of same length.. any body please suggest me some treatment.. :( :( :(