I'm only 20 years old and only 3 weeks ago I used to be horny all the time. Me and my girlfriend started having sex about 5 weeks ago. First few times it was great. Then one time i was horny like normal. I was in a good mood nothing was wrong at all. And it started going down while i was penetrating her. Since then it's just got worse and worse. I can barely get it up on my own or with her. It's not always hard in the morning either. Sometimes it is but not as hard as it used to be. Help this is really bothering me :(