So I had my first sexual experience the other day. I was with my girlfriend and two guy friends in my room. I didn't expect anything to happen because we were in the same room with other people, but next thing I know, we're on the bed, and I have my pants down under the covers. She was jerking me off, and I was fingering her. She didn't finish because if she had, it would've been messy, and the other people in the room would've found out what was going on under the covers. Anyway, this is my problem, I didn't jack off after that until two days later.... While masturbating, I realized that I couldn't get fully hard like I used to be able to. It also took me much longer to get to about 80% hard. ALSO, I couldn't keep it for very long.... I had to constantly be stroking it to keep it up. And finally, it took much more work to cum. I'm supposed to hang out with her tomorrow, and I have a feeling we'll get busy again, but I'm afraid I wont be able to get fully hard... And I'll lose it quickly if I am able to. So is this normal? Is it possible that because I've experienced the real thing, porn isn't as arousing? Is there anyway to fix this? Do I need to see a doctor... or will this just pass?