IMO the key thing to understand is that the neurotransmitters are
signaling agents in the brain- not fuel in a gas tank.
Feeling "good" has to do with having the proper signals in the proper parts of the brain at the correct times. Try thinking of the brain as an instrument that takes some finesse to play, not a louder=better thing.
Like, having a little extra dopamine in your ventral tegmental pathway feels 'good' because that is a part of our 'reward' circuitry, wheras if you had more in your cerebellum you'd have some completely random effect on your muscle control or something.
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Lucky for you, people have been trying to figure out how to "feel more good" for about as long as they've been around, so we're pretty o.k. at it now. Sunyata mentioned a bunch of techniques, and you probably already know about cocaine releasing dopamine. Nicotine does too once your brain gets accustomed to it.
Unfortunately these direct techniques are a bit crude and can have negative consequences, meaning you will probably end up feeling worse after you took them than you felt good taking them- in the long run.
There is open debate as to
the superior way to make yourself feel good all the time, but I think a lot of the best evidence points towards involvement in interesting and diverse situations in life. Try looking into the brain expansion, tune up, and stimulation that comes with working/playing hard on engaging problems. Also, avoid malnutrition and disease.
Are you capable living on that level?
