How can I be less sentimental?

I’m currently tidying my room, and I’ve come to a realization that I have been trying to ignore for a while.
I keep everything. I have way too much stuff. There are of course some things that are worth keeping but most of the stuff is things that I probably won’t care about in the future. I understand that, and I think that when I do actually get rid of the stuff I’d be fine. The problem I have is just getting rid of the stuff. I really shouldn’t have 30+ stuffed toys at my age.
Even just a better way to store this stuff would be good. Thank you!