Humans are a great ape species like chimps, bonobos, orangs and gorillas. They are not a monkey species.
Hmm but we also have a "lizard brain" which means brain structures that we inherited from even earlier, that can drive some kinds of impulsive behaviour. We are most recently descended from chimp-like apes, before that from something much more like a monkey, before that something like a rat, before that a reptile and so on. Humans didn't evolve all-new parts, we retain lots of evolutionary features from much earlier creatures.