weakness
is she wet enough
Could be performance anxiety. Here's a thought: whether you look at porn, receive some good clear thoughts in your head of what you would do, or what the other man is doing. Take those thoughts with you to your next sexual activity; no one knows what you're thinking. My bet is you'll stay hard, with or without that condom.
Maybe you're uncomfortable about where you're having sex or who you're having it with. I think it's more performance anxiety. Erectile dysfunction could be a trouble at your age but it is highly unlikely, especially whether you find that you receive erections while you sleep, like guys your age most often do. If your erection stays at those times, it's definitely performance anxiety. Maybe you're one of those nice guys who wants everything to be correct when he has sex. It's not just women who often feel that way.
You say she is your new girl friend, is there an old girl friend? Maybe whether there is you still have not gotten over her.
it's mean you penis is weak, eat well and do exercise. try to eat something that favourable for your penis like pork liver, clam, anything that has shell, trust me...
performance anxiety.
If you had erectile dysfunction you wouldnt be able to barely get an erection.
It's performance anxiety.
At just 20 years of age it's unlikely you that you have permanent ED. You could, however, have had a temporary case of it which can be put down to nerves and pressure of having sex at such a young age. You may not be ready for sex yet or you may just need to keep practising until you feel comfortable. Once you get over that, then it just comes naturally to you.
If you feel you may want to try some medication to help though, Exact Pharma sell some medications for ED. Some young men are taking these recreationally to give their sex life a boost, so you may want to try them. You can buy Kamagra and other ED products @ http://www.exact-pharma.com
Judging by your age, I strongly doubt that you have erectile dysfunction... sexual performance anxiety is something that hits most men at least some time, and they generally fear that they have a physical trouble...
Its all intellectual... check this out
your Mental State affects your ability to accomplish an Erection