What you're describing with, "How do you know everything is unsatisfactory?" is closer in thought to nihilism. Meaning-making in a world without inherent meaning is actually kind of the goal of existentialism. You should feel satisfied through existentialism, it just asks that you acknowledge your hand in the creation of this satisfaction. The only meaning that could possibly matter to you is the meaning you (consciously or not) decide to derive yourself. If this meaning is belief in a higher power? Fine, Kierkegaard was a theistic existentialist. Hardly the first, either.

You're in a sandbox, and you have to make your own rules to play by.

Meanwhile absurdism (the Camus variety, anyway) agrees with some proponents of existentialist thought (that life has no inherent meaning), but claims that the pursuit of personal meaning is useless - it instead implores people to accept life’s lack of meaning, and rebel by rejoicing in what life does offer.

You're in a sandbox, and instead of making rules you decide to play in the sand.

Not asking you to re-evaluate your claims, but I'm definitely using you as an excuse to talk about this!