What would you do if you didn't care what anyone thought?

I'd act like a child in public, skipping whenever feeling like it, climbing random things, doing all the weird body movements that my body asks me to but I would look like a madman if I did them whenever I feel the urge, I'd express my emotions freely, cry when I feel like it, laugh out loud without any explanation if I remember something funny, I'd randomly sing or dance...
Maybe I'd act entitled and rude because I wouldn't have a filter and probably also no sense of self-preservation. I'd annoyingly tell people that they smell bad or to stop smack with their mouths..

If I think about it, someone who truly doesn't care what people think might not even live that long because they would have diminished sense of self-preservation as well. Sooner or later they would come across someone violent who wouldn't tolerate the behaviour, possible verbal insults and being a nuisance to the others for doing whatever they want to with no regard to others.