How is it depressing? Relativity of simultaneity implies the universe is basically a giant crystal, future and past both actually exist. They almost have to for

How is it depressing? Relativity of simultaneity implies the universe is basically a giant crystal, future and past both actually exist. They almost have to for relativity of simultaneity to be the way it is. That means everything happening is happening forever, all at once. I guess if you live a shitty existence, then its infinitely shittier, but if not, its infinitely meh. Guess it depends on how you look at it.