Im 20 years old Im used to masturbation since 2 years I rarely do it now like once or twice in a month. Some times I experience nightfall. Since one year im experiencing PE. Pennis size has decreased. I get soo excited when I watch porn. Not able to control. So I stopped watching only. Sperm quantity is very less. Erection is not harder. Sometimes I feel pain in testis. What do I do now? My girlfriend who is elder than me is asking me for sex. Im giving her excuses. I need a proper suggestion.