If nothing matters, then it doesnt matter that nothing matters, so while I technically am a nihilist, since I dont see a plausible mechanism for how some kind of objective purpose/meaning could exist, I dont really think much of it. If nothing matters there is no reason for me not to care about whatever I arbitrarily happen to value anyway. Expecting the universe to find those things important too just feels kind of self-centered somehow.

Also: everything matters ☹️ everything matters 🙂