Can I offer some alternative advice? Maybe try posting a gaming request at your local hobby store or an online forum like meetup.com, and see if you can find/meet some local folks who are interested in gaming. Or maybe just join in someone else's game for a bit, and meet some people.
I find that actually having a semi-regular ongoing game makes all the difference in the joy you feel as regards all your games. Start small, but build a group of friends around the hobby, because at the end of the day, the games are not fun unless you have friends to enjoy them with.
It might be even more depressing if you sold/gave away something you truly love just because you haven't been active in the hobby for awhile. Do you have space to host gaming? If not, maybe travel to someone else's place for awhile, or find a good public place to meet. I'm not doubting that you feel the games have become a millstone, but I am guessing that the reason they feel that way is that you need a core group of friends to enjoy them with. Not to say some of that stuff couldn't go into storage or be sold if you don't think you'll ever use it.
Anyway, just food for thought.