Hey, I just turned 18 and I'm still a virgin but that's not the point. Well, usually when I mastrubate it doesn't last long and I'm done in less than 3 minutes. Should I be concerned about that or is it going to last longer once I actually start having sex? I usually watch some porn movies when I mastrubate so I finish real quickly. I'm also not so sure about my penis size because it doesn't seem long. Should I be concerned about all this? Thanks.