I can understand where you're coming from. I'm skinnyfat and 21 and balding aggressively. I feel the same way and have literal terrors because I was such a good looking kid and now I'm just destined to go straight linearly down in looks because my hair is literally falling out.
But, I mean there's a thousand examples, look at most of the UFC fighters/champions.
25, while the peak of testosterone and youthful potency, is most certainly not your only prime years.
Most UFC champs are mid 30s, most professional athletes are great into their mid-30s.
And that's just ATHLETICS at the highest level. You're probably not an athlete.
The truth of the matter is, 21 year old girls and women in general are universally attracted to older men. 70%+ college hotties would be in some capacity open minded to fucking an older man up to say age 40, then the number drops maybe to 50%, still plenty plenty of girls who are down.
After 25, your testosterone drops ONLY 1%! per year. Dude, and this is assuming you're not doing everything in your power.
Honestly if you feel this way, start on TRT. Literally every fucking person with a brain who actually is looking to compete is on drugs. People who think otherwise or rule it out as 'le bad' are fucking retards and you should thank them for opting out of the competition.
there's plenty of shit you can do, you should literally only grow more resourceful and age should be a benefit until maybe 45, then you're starting to get 'old'. There's plenty of 55 year old dudes who would mop me and you in a college bar TONIGHT
Diet, exercise, drugs and the lack there of. That's all it is. If you play life right you should only increase in sexual market value until you're 45. Yeah, you'll never be able to be a stud at a college frat party after 25, but who the fuck cares.