Help me Im 19 years old boy, I cannot masturbate, It was normal until one week ago, I was able to do it, Everything was normal, Last time I did it was one week ago, After that I cannot masturbate, my penis do get erected and I do get sexual feelings but no ejection, I have low libido too, I tried it many times in week but I cannot do it, What's wrong with me Whenever I try to do it no semen comes out and I get tired what's wrong with me?