Become a politician. You'd have an hide thicker than a rhino within a week
It will thicken with the mental scars, that life imposes upon us.
It's not easy developing a thick skin but it can be done. Respect yourself and know yourself then you won't care what others think of you. Whoever loves you like your parents, sister, brother, cousins, good friends is all that matters. Others can get lost. Talking from experience.
fake it until it's real.
Work on loving yourself. Eventually you won't give a d@mn what anybody thinks of you, then you can be yourself freely.
I don't think you can change who you are. Everyone is different and you are "just you." Nothing wrong with showing your emotions...
Like the calluses in your palms that forms with repetitive work. Just so your emotions
Watch the news.