ThatZealousOne:
Do I ever hear you about the drinking bit. And I have heard this over and over. Seems like a lot of people are of the "drink and screw" variety and don't know anything better to do. That is a life that is going nowhere and if you hooked up with someone in that it would go nowhere too. What kind of life are you going to have drinking your way through it? And if sex is your only interest then you have some major problems.
I really don't think there is anything wrong with you, I think you may be mature beyond your years and therefore are more farsighted than a lot of the people who surround you. I wouldn't take it personally to heart.
I think what you are doing is wise. Don't ask people out you usually wouldn't find interesting. Don't ask people out who are already in relationships. However DO NOT take for granted that they wouldn't be interested. Get a definite yes or no.
If you think you are boring change that, if you think you are not likeable, change that, if you think you are not attractive be as well groomed and best mannered as you can be and most people won't even bring your looks into the equation. And if they do they are too shallow to waste time with.
I think too, a lot of girls your age are looking for excitement, and that will soon fade. Boring becomes better.
I have a girlfriend who in her twenties for a date would make them come over and read a book. She said she didn't want to spend her life with someone she couldn't read with since that was one of her favorite pastimes.
So, think about what you would see in you that would attract you and see if there is something you feel you need to work on, (like self confidence perhaps? I see nothing wrong with you) and then also think about what you would want in someone you would have a relationship with. Perhaps firming up your idea of yourself and what you want and then going out and seeking it - do you see what I mean?
There are a lot of girls out there seeking a safe option, who aren't into drinking and partying either. And after a roller coaster ride, boring becomes quite attractive.
Being the extrovert that I am, I would discount the nerves, everyone is nervous at first. New relationships are hard, taking rejection is hard but I would rather have the rejection than not know....