Suggest Treatment For Erection Problem And Low Libido

Good afternoon, I m a 21 year old male and I ve been having a very embarrassing problem. Recently the tip of my penis has become numb to stimulation. Sex and masturbatjon both get me 3/4 of the way hard but I feel little to no sensation in the tip of my penis. It has become a problem for me In the bedroom and I don t want my girlfriend to continue to think it s her fault. I also have low libido and rarely wake up with mornin erections like I used to. My balls are often shriveled up and don t hang like they used to. I drink 3-4 times a week and smoke casually but other than that I work out and my diet is fairly good. Please let me know of any remedies to my problem I am becoming desperate for a solution and I m too young for this to be a consistent problem.