How to last

Guys I need help lasting long in sex, I’m 20 years old and I train quite often and my diet is genrally quite good. Since my young years roughly around 16 years old to now I’ve been sexually active on and off. Active in the beginning and due to lockdown inactive then after lockdown I was active again. Then on and off inactive and now that I’m trying to get active again I went from lasting minimum 10min – a hour and now I can’t last longer then a minute, sometimes even 30 seconds. Even if I go for rounds my second round will only last a minute max, any help? Please