I have no problem eating alone. I had a job for a while where I was on the road all the time... sometimes I'd get together with a group of my coworkers for dinner, but other times it wasn't possible, so if I hadn't eaten alone, I wouldn't have eaten.
I rarely go to the movies, but when I go, it's generally with my husband and/or some friends.
Grocery shopping, I can do alone. If I'm going to the mall, though, I usually drag my husband along.