Premier

Hi, I am new to this board. I am 23 and have been in a relationship for about 2 years. I love the way my woman looks. She is everything I've always wanted physically and emotionally. We've been sexually active for about 8 months now. When we first started we had incredible sessions of love making. Our sessions would last at least an hour. These past few weeks I've found that I cannot maintain an erection at all. I am still in love with my woman and just looking at her pleases me so, but when it comes to love making these days I just am not there. My mind wants to so badly but my body doesn't not respond. Even if I am able to achieve I quickly lose it within a minute. I have been struggling so badly because I cannot the same feeling of arousement that I used to previously and not only is this driving me insane and sexually frustrated my woman is noticing it as well. What should I try? Is this permanent? I do not want to go to a doctor seeing as my age is rather young for sexual dysfunction. I should be at or near my peak but that is sadly not the case? Please help.