FWIW, I think all of us question our own sanity from time to time after we think about our photography addiction and expenditures. As for me, if I didn't shoot tons of stuff for scouts, school and church, I would probably shed a lot of gear. For me, I feel relevant and necessary when I shoot to benefit others. If it is just for me, that's fine for a while but I'm not a pro and if I don't have steady "jobs" to help me justify all the expenditures and equipment, I'll start to feel a little silly having all this stuff and just shooting family candids and other stuff for myself.
So I suggest the OP first consider how he can put everything to use and in perspective before he sells. Can he become more motivated and inspired by shooting for friends, charity, volunteer, etc. It will be challenging and rewarding. It will add another layer of purpose to your hobby and you'll be appreciated.
Just a thought...