Well, at least you admit to being a narcissist.
To find inner peace, you must first be willing to accept yourself for who you are.
Due to the size of the internet (literally nearly the entire world) and the rate at which the online populations shift over time, it is nearly impossible to spend your time worrying about what everyone else thinks online. Because no matter who you are, there will always be people who disagree with you, people who love you, people who hate you, and endless variations between.
I have seen people who spend their lives trying to cater to everyone on large scales, and eventually they all melt down, it is too much for one person to take on that sort of responsibility. Therefore, a modest application of the opposite tactic is required for survival, create a shell that is unapologetically unchanging which reflects a portion of your inner self. And use that to interact with the internet. It's a survival tactic which becomes required to deal with large populations.
In smaller more close-knit groups a person can afford to interact differently.
As I said, on this forum, I have dedicated 1 aspect of my personality which I have chosen to express. It is represented by my chosen avatar. This aspect does not care what other people think beyond it's own selfish desires. Hence it has taken on the form of a demon (a succubus specifically - as this forum is dedicated to sex and physical attraction)- which I felt appropriately matched the content of this forum.