I think you may be young, due to the references about going out/partying. I know that makes it difficult. I felt like I needed to be "going out" to socialize until I was about 26, after that my drunkenness got so bad I had to drink at home or risk waking up in jail. It is hard when it feels like you are missing out or something, but I would wager that you aren't missing much. My suggestions?
Watch a movie. Take a bath. Compile a playlist of songs to listen to, if you have an mp3 player, you can take this on a walk. Do you like to read? If not books, maybe magazines? Local libraries also have newly released movies to check out.
It really is a good feeling when you realize you feel good being at home, unaltered. I know it doesn't come easily or right away, though.