How to be an insensitive person?

I am sensitive but throughout the years I have learnt to ignore things that make me emotional and all that. I have full lips in Jamaica they call it "long mouth" and considered to be unattractive. For years it was a problem until in my teen years I let it go and let people have their say. After all I did not make myself and this has caused me to focus on my studies while other girls where focusing on boys. So here I am single and a single parent with a beautiful daughter whose classmates keep telling her how beautiful I am. See? It paid off. just ignore the things that don't make you a better individual and focus on what makes you better, more intelligent, more handsome/beautiful. I am talking about the inner you -let it shine and be who you are and grow in maturity. God bless