i cant help but feel that i identify fully with you, skyliner.
but let me ask you this.
do you have a few (even 1 is more than enough) close friends,
people who have stuck by your side despite your cold
appearance?
do you have definite personal goals, dreams, ideals of who you are
and what you want?
do you yearn to be yourself and heck it if people dont like what
they see?
i am aloof and indifferent to those who are strangers to me. but to
those select few who stuck by and gave me their support in the
darkest of my moments, i give them my heart and loyalty, and the
most charming of smiles. because i feel that they matter to me, and
i only have to care about them, not people who dun matter a lot to
me.
as such, i dun smile much when i am among strangers. people find me
fierce, or unfriendly, but they dun bother me. but when i find
someone i can click with, however, i know i can open myself up and
let him/her know me better. and that was enough for me.
perhaps you should first of all, assess how strong your sense of
identity and sense of worth is. that way, you wouldnt really be
affected about people's opinions about you. then you might be able
to live by your own principles.
in the course of your lifetime, you will surely fine someone who
will accept you for who you are. 
