Why all of a sudden do i feel weird?

It's called depression. Being lonely for a long period of time can REALLY get to you. You see your friends or a random couple and start wishing you were them. Beem there, you just need someone to be with on a romantic level. Its normal so relax. I was single for TWO agonizing years after I got dumped by this girl I really cared for, and being along added to it. I spent most of my nights crying myself to sleep. It was pretty bad. Just find someone you interested in and go from there. Good luck!!