Life aint the same as before, we all experienced this in our lives, no matter if you just turned 20, 40, or just turned 13, everyone and everything experience this, even earth itself.
We lose people. And its so hard for our self's to say "Thats just life" its such a hard thing to accept. In many cases i just dont want to accept that either
Good things in life last, but that doesnt mean bad things in life stays forever, were humans after all, who can make changes in the world with enough determination.