I am severly depressed, however I have discovered I have real friends that care but...?

I was invited to go out with some friends, basically new friends that I have never really hung out with before, great people though, but I haven't been out in so long, to meet new people that is, I have been alone for so long, I'm not so sure what I want to do. A large part of me says don't go, make up some b.s. excuse like you have been doing for soo long, but another part of me says, why, what are you waiting for, just go out there and try to have some fun. Try to be happy, what is there to lose at this point, the cost of a few drinks?... I just don't know right now.... help?!?