hi im 16 years old and weigh about 155 pounds. My medical history is pretty good and i havent really had problems. I have a girlfriend now and i really like her but i cant seem to get an erection when im with her. If i do get one it isnt solid hard and doesnt last long. Im wondering if maybe its too much pornography or masturbation or maybe some powders i take for working out have affected my penis. I havent taken the powders and weeks and threw them all away. Shes very understanding and says she understands but that doesnt make it okay. Please help its ruining my relationship and my life .