I remember deciding at the age of 10 that I was never going to care what anyone else thought of me. No one liked me anyway, so I had nothing to lose. Peer pressure wasn't an issue because I had no "peers". I don't remember feeling bad about this--I just remember feeling free.
It took many years and plenty of inner healing before I came to feel neutral about myself and another decade or two to actually like who I am. I don't share my opinions because other people don't want or need to know them. More people like me now than ever before, but I'm as free as I was when no one did.