Im22 physically n mentally active, wrkout, train martialarts, folow a healthy diet. recently i hav trouble holding a boner/lasting long. any idea why?

Erections & Brains: Given your age this is most likely a temporary condition and it can be made worse by your thinking, worrying about your erections. Erections are a complex combination of physical stimulation and mental stimulation with the brain being more than 50% responsible. Any worry or fatigue or stress can make getting an erection or maintaining an erection more difficult. Give it time. Stop worrying!