In the context of my how I feel pain and am prone to substance abuse.... I came accross a subject area that is kinda new but amazingly simple and seemingly obvious. It is called the "Highly-Sensitive Person" or HSP... a personality type that is becomming recognized more scientifically.
Basically.... it describes about 15%-20% of the population base of Humans and many other mammal groups. Basically those of us who are of this type are simply more tuned to sound, smell, taste, and feelings. We can get overstimulated and need solitude to decompress. We tend to be more complex and feel things deeply. Some may say too deeply.
It goes well-beyond that but there it is in a nutshell.
I took the self-test on the web site for which I scored well into the range of affirmative for the HSP personality type.