Christ that is terrible... and here I thought I was the unluckiest bastard when I started diffusing crazily at 17.
At this point, Minoxidil is a no-brainer. I would also consider Finasteride even though you're only 15. Once you start balding, you're pretty much biologically a full grown adult already. By this point, your growth plate has most likely already fused and you won't grow any taller. Just going from personal experience, my body was no different at age 17 compared to now, and I did not grow another inch since then. Had I known what I know today, I would have started finasteride at 17 without hesitation.