Well, I believe that many, many people with anxiety disorders have nightmares. Also, it can be a result of PTSD. I worked as a veterinary technician for 12 years, and ended up with PTSD because of it, so that's another trigger for nightmares. It disturbed me more than I realized at the time. Had I known these nightmares would continue for over two decades, I never would have gone into that field!

I also have a phobia of doctors, ERs, and medical situations in general. A lot of my nightmares center around that because I haven't come to terms with it, or really even faced it.

Why do you think you are the opposite of what every girl wants in every respect? Sounds like you have low self esteem, and don't give yourself enough credit. The thing to do is expose yourself to social situations, but gradually. Don't just go to a very big party. Start small, like with just a few other people, and only stay for a short while. Do that regularly, gradually lengthening the time you stay. Don't expect anything of yourself. Mostly listen if it makes you nervous to talk. In time, you will come out of your shell. I had social anxiety for a little while, but it went away as I got older.