You DONT know ME

Your sarcasm is never going to affect me. Let me be very clear in this, no matter how harsh or how silent you are going to treat me, it's never gonna hurt me anymore. I have gone through so much and enough of heartaches that your sour face and rude/ignorant answers towards me is never going to affect anymore. You have done much for me, so much that I owe my lifetime to you but there is only that much you know about me.
I have my reasons for being rude or sarcastic. Treating me like a piece of thrash is never going to get you any closer to understanding why I behave such a way. Tormenting and despaired moments of my life, I walked through it all by myself. I faced those harsh words threw at me when all i was, was a innocent girl. I faced cruel criticism over something that i could never be blamed for. I got framed, accused and blamed for something I was not aware off. The result? I faced punishment. I kept it all to myself. I treated it all with a smile.
You do not know those times I cuddled around and cried silently, you will never know because it is never my intention to share it. I choose not to only because you crossed my trust in more than a occassion. Certain incidents that you have caused did not affect you in any manner but it destroyed me completely. I never voiced out neither did I make an issue, I always have told myself to leave it aside.
Cliched dialogue, "I know you too well....", well I got news, you do not. Anger neither frustration is related to it though. It is not your responsibility to be clear of what I feel deep inside. Ignoring me because you are dissatisfied with my tone of speech or the way I speak in frustration is one thing you ought to learn to accept.Do you think your engagement going to hurt me? Forget about it. Pardon me, but I was never treated well in my mistakes and I recall numerous times being thrown words at by you. Some so hurtful it changed me for good and some are unforgetable as your munbe vaa .

What am I? A stress ball? Or dustbin?