Male Baldness Info

Im 15, male, and I swear I’m going bald. There’s a history of baldness in my family, so I knew I going to eventually, but I’m only bloody 15!
My hair has always been flat, straight and not particularly thick, but around the crown and down the back it’s seeming to get thin, and you can really REALLY see the lines if I rough up the back and there’s lights on (and even if there isn’t).
It might seem trivial but it’s really killing me. My dad started properly going bald when he was 25, but for my uncle it was about 30-35 and my granddad was closer to 40 I think.
Am I being stupid? And is there anyway to fight it off?
Also, things such as baldness following your maternal side isn’t true, it’s both sides. Trust me, most of my family is living proof.

i am 1 of three brothers what are my chances through punnet square or whatever they do to determine the likelihood
i know that baldness is dominant in males and woman have the recessive gene or whatever talked about it briefly in biology class
and if i would go bald about what age would it start