It could be...
Dehydration, lack of sleep, too much caffeine, low zinc levels, or just you stressing about nothing. Shit, 20 years old I was hanging 45 plates off my crank. 38, my shit still works well, seem to have better control over the "Two pump chump" syndrome. Shit dude, 20 and worrying about your dick???? What happens when you hit my age?!