same thing use to happen to me, I'll tell you some cures =]
*Pick up a hobby* It's best to have something to do, maybe write a story, paint, play chess, something is out there for you, you can even type down What's my hobby quiz That is how I got into art and now I do it all the time! =]
*Invite someone over or talk on the phone* Lonliness can happen when your not having fun in the socail life, get a freind over and go shopping or to the nail salon! If you can't invite them somewhere/over, talk on the phone.
*Adopt a puppy* lol, this step is one that will be tough, but if you get a little best freind your sheducle will be full with a pup that wants to do everything with you! If you can't do that, you can go in the puppy store and say your just browsing. If you think you will adopt one if you go to the puppy store I do not reccomend this.
Oh yeah also, If your just browsing make sure not to get to close to a puppy if you can't get one.