What am I doing..?

Yes, I really wonder want am I doing. each day is passing along, time is making life move like a roller coaster. I know, I am working -> I am earning, but still why this thought is making my mind disturbed that I am not doing anything worthful.
I know I am fulfilling all the expectations I have from self...but...am I expecting something from others..? from the world...? may be, and I feel this isn't doing good to me. so now what? don't care for the people around me? dont care for my friends...no thats not a good idea...then what...i dont see any solution to my restlessness. life takes you through all ups and downs. this is a good time for me , yet i have my own complains, how selfish it is on my part...
My weakness..may be m weak at heart, i take everything to my heart, when i see something or hear someone i view it from all possible angles. no matter if it isn't of any importance to me or even if it is important to me but is noway concerned for the other party. well thats how i am...and have to cope with it. today i have learnt a lesson though. no, again m wrong...i havent learnt, i have just gone through a lesson. moral of the lesson is below, I dont know when i can grasp it.
"Expecting the world to treat you fairly, is like expecting a lion not to eat you , coz you are a vegetarian"
someone can break your trust within a second with the utterance of a single word. everyone knows that trusting someone other then your own self is foolishness...yet people like me make these kind of mistakes often. Yes, every human is different, with slightest magnitude or totally opposite. your image in the mirror can differ from your personality sometimes. its all your perception. and the perceptions are hard to change..rather nobody likes to change their own.
So whats this all upto? I need to change my self and become strong hearted or feeling less like other people or just be in my cocoon and never try to look out of it. the latter will surely make my life boring and make me boring as a human, but thats what i might prefer from now, after a shattering experience...

PS:- comments are not expected, as my thoughts are noway concerned to any reader. everybody thinks different...