So... ummm this is what I studied, got my degree in, and did an undergrad thesis in so sorry you are stuck in the 20-30 years ago idea but we have learned more about the brain in the last 5 than in the entire human existence.

If you knew anything about this topic you would know A) a neurotransmitter is not "simply what happens in the brain when something makes me happy" and B) wouldn't ignore the HUGE impact dopamine has. Dopamine after all plays an enormous impact on brain chemistry in general dopamine creates a pleasurable high when desired actions are performed. It is directly involved with movement, memory, reinforcement, and reward.

Sorry sociology doesn't work when it comes down to a hard science and this is coming from someone who got his major in psychology and a minor in neuroscience.