i am 24 years old and when i was 17-19 had the best sex ever and had it very often.. since then ive been very depressed and really dont wanna have sex.. but i want to please my girlfriend but kinda hard to do that when i get an erection start to have intercourse and either i immediatly ejaculate or go limp.. why do i not have a sex drive anymore? and why the change in my stamina?