You cannot force yourself to meet someone, of course, just to have sex, sure, but, that's not what you want. That will only be a temporary fix anyway, your mind will probably still be on her. That's a long time, 6 years. Give it time to meet someone, sure look, you need a friend right now.
1. Time, as cliche' as it sounds, time.
2. Do things that are good for you, with family and friends.
3. Stay busy.
4. Do some reading.
5. Discover some new hobbies, anything interest you, that you'd like to try?
6. Volunteer during the holidays, giving back, and giving of yourself, will make you feel more worthwhile about yourself, since you've lost her.
Those are just a few, do things again, that are good for you, stay away from the booze and crap, it doesn't help. You'll make it.
