Get your butt off the couch and go out and enjoy the beautiful weather :) Hang out with friends....dinner...shopping ...a good movie....so much to do, I'm getting myself motivated to go out as well hehe :P
I think you should get a pet I recommend a cat or dog because I have them at home and they are very very snuggly and they love the play get them from animal center but don't got a pet if you don't have time for it and they need a lots of attention food and water and shelter
It might be hard to get yourself to hang out with friends, but you have to get involed in SOMETHING. Just get involved in a sport or club or something. Dont be afraid to just try new things. dont be shy.
Feeling lonely from time to time is part of the human condition. Surrounding yourself with people doesn't necessarily make you feel less lonely. ?read: "The Purpose Driven life" ?Listen to "Home" by Michael Buble"