Cancel your account, tell your friends online you're going to spend some time with people in RL you've neglected since playing. Worked for me. You can go and play again any time in the future, just tell yourself 1 month without WoW, and I'll see how things go. You'll probably find yourself having fun playing other games (on PC and/or Console) as well as just generally talking to friends you haven't spoken with in a while or haven't spent time with as much as you used to.
Now if your every friend you have plays WoW too, I don't have advice for you. My friends and I played EQ when we got out of High School (1998) to about 2 years before WoW came. We played SWG, and that was the last game we all played together. Since then we splintered into our own games DAoC for me, Lineage II for others, WoW for some; I eventually played WoW for about 9 months, it was good but I realized I was getting addicted like was in EQ. Lucky for me, the game is just like EQ except a smaller end-game. So I felt a bit bored too.
Hopefully though, cancelling your account and telling the people when the month you're paying for runs out you'll be gone for a bit to spend time with people in RL. They'll understand, probably tease you a bit to try and get you to play but it's all in good humor. My guild still wants me to come back for BC, but I doubt I will. I might check it out, but I don't feel a desire to play like I did before. Once you detach yourself from your characters it should be easier.