Edit: read my comment down below for clarification
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I recommend the lecture series “Neuroscience of Everyday Life”
The short answer is, we don’t really know yet. Presumably you are referring to dopamine and serotonin. These are actually only a tiny fraction of the neurotransmitters used within the brain (glutamate and GABA are much more prevalent) though they are still important.
We have a lot of evidence to support the idea that dopamine is involved in decisions and reward, and the prevailing idea is that it is an evolutionary mechanism that makes us favor making decisions that have favorable outcomes.
As to why this logically beneficial trait has the subjective quality of “feeling good”, we don’t really know.
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