>Should I drop out of college since I can't make friends?
No, I think this would be counterproductive to your personal development and is a pretty destructive move on your part.
Not only because your education will suffer as a result but also because you are depriving yourself from an area with a lot of socializing potential. Your lack of social ability needs an arena like college for it to grow and improve. Ditching college right now would be spitting on your self improvement. You're faced with a challenge and you are choosing to flee rather than to fight it. This is not good, especially considering the importance of social skills, as you've noted.
Social skills can improve and deteriorate. They're like muscles, train them and they get stronger, neglect them and they get weaker. You leaving right now will only jeopardize them even more.
There are thousands of people in college and probably hundreds that you would get along well with. As cheesy as this advice is, you're going to have to put yourself out there if you want to meet a close group of friends. By this I mean you're going to have to join societies and attend college events. Initially you may be pretty awkward, but as time goes on, the more you expose yourself to situations like this, the more comfortable you will get and the more people you will be confident in approaching.
If you want a good resource on socializing in general, this site helped me a lot back in the day.
http://www.succeedsocially.com/