You've encountered them at work. You've heard them on public transit nattering away to some poor trapped soul. You might even be one (hopefully not). But they can kill your enjoyment of life in general and your sewing hobby in particular, and that would truly be a huge shame.
On the "to do" list I recommend taking in a sewing show with the intent of fully exploring all there is to see and do. Don't go with a friend whose interests are different from yours or who will drag you down. Better to agree to meet up at the end of the day for dinner and go on your own merry way the rest of the time.
If there's a Negative Nellie in your sewing group, limit the amount of time you spend listening to her complaints. Give her two to five minutes and change the subject. Otherwise you will find yourself sucked into her world of darkness and go home feeling down, rather than energized. That's not what you signed up for, is it?
What will you do differently in 2014 so that you can get more enjoyment out of your sewing?