I can honestly say I know how you feel, I was there. I am 29 and I completely broke down when I got the AGA diagnosis. I was very, very depressed and bitter.
I'm in a better place now and I wish I could tell you exactly how I got here, but even I am not sure how. I think a few things contributed: I'm a nurse, and I see people in the hospital who have devastating illnesses. Hair loss is devastating too (I would certainly never argue otherwise) and I'm not sure the pain will ever completely fade, but my body is healthy. It can do everything I would ever want it to. Since my diagnosis I have started working out a lot more, and I find it helps me feel that I have agency over my body. It helps me feel in control, and hair loss really robs you of that. Not to mention it really boosts my mood and self esteem.
More than anything, I realized that the people in my life who love me don't love me for my hair. If anything it's an afterthought to them. I'm trying to see myself through their eyes... and it's a work in progress, but it helps. I know that probably sounds trite, and I really don't mean it that way. I have found some peace in the last year and I really wish that for you too.