How not to care about what other people think / do / say about you.

Probably the biggest frustration and difficulty I have had in advancing mentally is my tendency to still be engaged with “caring” (emotionally) about other people’s perceptions of me. It used to be so pervasive I couldn’t really function in life. Over time, with much effort, I have gotten to the point where I don’t get physically ill over these types of things very often, but it still is not something I feel I have gotten completely over. Any advice / thoughts would be appreciated. I would really like to get completely to the point of not being mentally manipulated at all. Thanks.