When I'm depressed I feel like that a lot too. I end up agreeing to a lot of outings with friends that I don't really think it's worth it. Aka the effort to go is just too high and a lot of the time I walk away thinking that I didn't really enjoy it. But for me, I need to see people to get energy so I don't exactly have an option I always have to try.

Choosing which friendships to maintain is your right though so don't feel forced to go if you don't want to. But I always suggest giving it a shot since I'd prefer having more options of people to hang out with than less--and having more connections is always something I'm looking for.

Generally though when I'm feeling better, I actually really enjoy hanging out with them so I figure it has more to do with how you're feeling at the moment. But if it does continue then it's probably just the people haha.