I celebrated my birthday with a girl I've been dating for awhile. We had sex before, and I was so nervous I went soft. TMI, I know. I was also on citalopram, but made it difficult to get an erection and impossible to climax. When we got sexual this time, I was drunk and couldn't even get erect. I feel like I'm useless and I'm seriously panicking over this. She thinks I'm either not attracted to her or because I may be gay and in denial. I'm very attracted to her, emotionally and physically, and I know I'm not gay. I don't know what to do, and I feel like I'm in a pit that I can't climb out of.