I can relate. Having grown up without the tradition of xmas, it really doesn't mean anything to me, even after leaving the JWs and living without their influence.
I don't have anything against xmas, or how people get excited about it. I get invited to xmas parties, and I go, and enjoy them. I've received gifts, and even given a few to a select few people, who I felt moved to give something to. I like some xmas songs, especially the classics and a few of the ones popular during my youth (Lennon, Springsteen, Greg Lake, etc).
But the so called 'xmas spirit' or 'joy' isn't there. It doesn't exist for me. I can't get excited about it, or care enough about it to drive to the mall in xmas traffic (the single worst thing about xmas - traffic). I have no sentimentality about any of it. At my most cynical, it's just a marketing ploy to sell shit. At my least cynical, it's just a day off work, maybe visiting friends or going on a trip, or maybe just a movie. (that used to be my thing, go to the movies on xmas. But now they release blockbusters on xmas weekend and it's too damn crowded)