I agree to trying volunteering. If it works for you that's great! However please don't feel bad if it's more than you can handle. Sometimes we're in a place where you can't spare any of what you have inside.
I read that when you volunteer and think of other people instead of yourself your depression will get better. So I tried. It made things worse and piled guilt on top of everything else.
If it's too much for you now do not feel guilty. You may be up to it in the future.
You have to take care of yourself in order to have anything you can share with others.
Just my two cents...