Male Baldness Info

I straightened my hair for about a year with an iron. I am a 16 year old, male, athletic, healthy. I have recently shaved my head to a number 3 and the hair seems to be not AS thin, BUT it is still thin on the top of my head (crown area) the rest of my hair is very healthy. I am worried that I might be going bald , there are NO signs of baldness on my mothers side of the family. WHAT SHOULD I DO! AM I GOING BALD? help me please.

Will my hair ever grow back? I am 24/male. There is no baldness problem in my family. Lately (since the past 8 months), I have been under tremendous stress (physically as well as in the form of mental tension). There was tremendous hairfall during this period. There are no bald spots on my scalp except near the upper corners of my forehead.Also there are some spots on scalp where the hair density is very low.
I am afraid that I might go bald. Is there anything that I can try to ensure that I grow back hair (if possible, faster)?
Thanks very much for your suggestions.