help me with my social disconnect?

[Adam]

I have a medium group of friends from highschool, I used to make friends easily, and I had a girlfriend for 4 years. Ever since college started I've been single and my friend group separated, going to other colleges and such. I havent made a lasting friendship since, and I feel alienated in the dating field (I was never the type to feel otherwise in the dating field though so I digress). I just feel like ive been in a rut. How do I get out of this?