How do I go about getting a girlfriend?

I have only had one girlfriend to date and that was because I knew for certain that she liked me in return. Well, that was sophomore year of high school. I am in college now and I haven’t had a date in over two years. For one, I don’t know how to “flirt” and all of the female friends I have are all in the
“Just friends” zone or are not attracted to guys of my physique in any way, shape, or form. I am seriously at a loss and I don’t know how to dig myself out of this rut. Any thoughts?