A lot of us isolate ourselves when we're depressed and that doesn't help. Maybe you don't want to be seen or maybe you just don't have any friends that like what you like. If you don't have anyone to do activities with you can post an ad on Craig's list in the "activities" category. You have nothing to lose and everything to gain. You can sit there and complain about not having any like-minded friends or you can make and effort to find some. Who knows, you might find your soulmate.
Hope you're feeling good.
p.s. email me if you want to do some skipping.