> Most people who complain about not being able to learn how to deal with people are afraid to or just don't want to put themselves in the position.
I wouldn't use the word most, more like many.
But regardless, you make it sound like there is something wrong with such people for feeling insecure when in fact people exhibit insecurity in a wide variety of contexts (job interviews, heights, closed spaces, etc).
Most insecurities can be mitigated with experience. After the first few roller coasters it becomes easier. The common defeatist cycle with "people skills" is "I don't have 'people skills' " -> "I don't want to engage in situations involving other people" -> "I don't end up learning how to deal with people" -> "I never build 'people skills'"
I wouldn't use the word most, more like many.
But regardless, you make it sound like there is something wrong with such people for feeling insecure when in fact people exhibit insecurity in a wide variety of contexts (job interviews, heights, closed spaces, etc).