How do you get a girlfriend if you need one badly?

First, you don't need a girlfriend. No one needs a girlfriend.

Second, if you want a girlfriend badly, learn how to communicate with girls.

Finally, stop looking. Searching so desperately for a girlfriend communicates--guess what--desperation. Desperation is not attractive; in fact, it is quite repellant. So, just relax and live life. Enjoy doing what you enjoy doing, and be open and aware of the girls around you when you do that. One of them might just turn out to be the one.