Are you reluctant to do things for yourself?
If you're fine in a group, maybe you're working hard to please others, but when you get alone, you see no point to it?

You shouldn't go in to solitary situations thinking that you won;t get anything done because you're by yourself. If you have to get something finished, go in to it thinking, "I will do this today!". Don't think about how you're alone, focus on how beneficial doing your task will be to yourself.

Maybe that wasn't helpful at all...

But, OP, good luck!!