So ive had previous partners but this was the first time me and my current girlfriend attempted sex. We were both very horny and performed oral on each othher for about an hour each. She gave me a blowjob and there was a lot of precum! I was really horny! So we decided to have sex. But by this time, i didn't feel as horny. I put on the condom but my dick went half hard on me and couldn't penetrate her! What's wrong with me?