you can change it to something else if you really want to, and it will still belong to you, but still others will use it more than you, without being able to truly take it

I warned you guys... it's a good one

HERE'S ALL THE CLUES IN ONE THING

It belongs to you but others will use it more than you
they will use it, but they cannot take it
you've had it your whole life
you can change it if you want to, but the same rules apply