I don't think I collect anything - by the normal definitions of collecting.
If I collected anything it would probably old science instruments and books, I find these fascinating, but I dont think one old physics book counts as a collection. I could also imagine collecting writing tools - pens etc - as I love a nice pen. But I only own what I use. Or vintage cameras, I own two, but use them for photo effect. But I could imagine collecting.
I do, though, like most people in the west, own too much stuff. I dont mean I am a packrat - I'm atually quite good at getting rid of stuff. I dont mean I am anything like those people on TV, house looks nice and tidy, not cluttered. But I still have a lot more stuff than I need. So much stuff it weighs me down, so I have started clearing down. Even on books - 150 given away in a year. I'm mostly making sure I use up my stuff before I buy any more.
I do have one thing catalogued, but I dont think of it as collecting. I *did* read a book a day for a while and ooved to a place without a convenient livrary - as a result a few years down the road I own 1500 books (counting cookbooks and comics and stuff). That is not a collection to me because I do not seek any kind of coverage or completeness or topic or anything.
I cannot resist a clever board game, even when, like now, I have noone in the region to play them with. Banned myself from the ebay board game forum and from bgg