Honesty and sensitivity

when i first came here in Sydney, my friends we're suprise how straight forward i am towards them. one thing about me is that i like to speak out what i feel without noticing the effects of every single words that i have said to my friends. one of my friend, told me few months back that u can't be straight forward in everything i do. well honestly, i think it is better to tell or discuss with someone about the things that makes u uncomfortable about them rather than talk behind their back.
my sensitivity sucks big time. i don't care about what other people think about me, but that is just who i am. Theres a lot of things in my past that build that attitude towards other people. So, it is not easy to change that like a switch of a button. there are a lot of positive things that came out from this attitude, i am happy most of the time, i dont have a low selfesteem about my image and etc. the negative side is that, i dont have a chance to improve myself because i dont have feedbacks from other people or i refuse to, i sometime deviate from what i use to belief in, and i dont have a lot of friends because i just dont care.
i have a friend who told me about what other people say about him that makes him uncomfortable with himself. and i said to him " u r big enough to brush it off". hours after that(thats how slow my slow my sensitivity came into effect), i feel bad about what i said. I should comfort him more. there traumatising things from his past that makes him the way he is. i should have not act like i know how to handle all things. I am not him. i dont know what he had been through all his life. n i am sorry.