I Started to date this girl last year. She was a beautiful girl. We would have foreplay.. wed both be really aroused. Did that for a few weeks. Talked about having sex a lot. Then finally the first time we went to have sex I couldn't perform. :(.. Then of course a few days later and every time after that for a few months was fine...

Around 9 months later I have a new girlfriend. Same thing happened just happened. I don't know why this happens to me. Its weird. Is it because I'm nervous? Btw this girl is 19 and she's a virgin, And she's gorgeous. And I'm confident with my looks and my performance. So I'm stumped with what is happeneing with me... :(

Perhaps performance anxiety? I suggest you try to keep it out of your head and really, don't think about it.

See a doctor if you experience this again. Many 21 year old guys think they are invincible. Fact is there are medical conditions that can and do kill 21 year olds all the time.

Regardless get a complete physical and bloodwork... do this every year to make sure you don't get blindsided with a serious problem you had no idea you had.

It can be anything from just being nervous to a serious condition.

thanks for both answers ^^^, appreciate it

Sounds like you are nervous about how you can perform. It sounds like you were(are)picking and judging women on their looks, and it worries you that they are judging you on your looks and sexual performance. Very stressful! :)

Relax... and sex is so much better if there is a super mental connection that really turns you on naturally.

Nerves... lol. Unless your on any medications, or were drinking.. etc. Those can also affect it.

It's just some P.A. :-)

(Performance Anxiety) It simply sounds like you are rushing sex before your mind and body are totally ready.

In any case, just take a little longer perhaps and once the time is right, learn to enjoy foreplay. It is the best part. When your bodies are ready, then slowly enjoy. Nothing to worry about my man.

Also, it's not 100% your fault. At a young age many women think a guy just has to show up and go - which is often the case - but guys like to connect with someone too and feel special... maybe you are seeking that too...

Probably nervs.
She is a good looking girl as you said and you are worried she won't enjoy or something like that.