I also tend not to be terribly comfortable with indiscriminate hugging.
With my boyfriend and my children, there cannot be too much physical affection. I'm also comfortable hugging close family members, but don't crave it from them in same way.
As for friends, if I haven't seen them in a while, then a hug is nice, but certainly I'm not real comfortable with it being an everyday thing.
Work is the real place I have trouble with it. My coworkers tend to be quite huggy as are some of my clients. I never initiate hugs at work, but I try to remind myself to take them as a compliment...that the hugger is demonstrating affection for me. That's always a good thing.
Now, if I have had a few drinks and run into someone I know.....TOTALLY different story....