Hi, my baldness started when I was 12 as well, since going through puberty I would say.
Above all, don't panic, I know what it is, at college I was called bald.
Try to see my last post, I explain my case maybe you will find yourself there.
The only advice I can give you is to eat well.
Starting to lose this hair soon is not normal at all and it is almost impossible that it is hormonal, around the age of 17 I decided to readopt a good diet, I only ate sugar before, my hair does not fall out and I live a normal life now, I have a lot of friends, I like girls quite a bit, things that I would not have been able to do if I had not worked out this hair problem.
Go see a dermatologist, take a blood test to see if you lack iron or zinc.
Courage, for having lived my college / early high school years we were horrible