It's fine, really.

When things are indeed NOT fine, or it's a little fucked, like your car just took a shit or something is not how it's supposed to be, you just say this phrase and sometimes deal with it later, or it isn't your problem.

Friend 1: "Ya know, I don't think there should be that much smoke coming out of my engine bay,"
Friend 2: "Ah, it's fine, really."