How uncool is wearing a fluorescent jacket?
Too many questions. This forum was not designed for us to do your homework. If you were having a problem with some aspect of these problems, we would be happy to help, but when you just copy the questions out of a book, there is little impetus for us to bother with it.
Don't fret. You don't need to go out and meet people. It sounds as though you have some friends you enjoy being with. Stick with that. If you have good friends, there's nothing wrong with being single. Chances are that one day you'll accidentally fall into a relationship, but just let it happen. If you try to force it, you can make yourself miserable.