Why?

I don't know since when I'm an optimist person??? I mean, you see many people open their hearts and confides me by telling me their problems, snags and stuffs and I'm the one trying to comfort them and cheer them up. Instead, I can't even think like how I said to other people whenever I'm dying from inside by saying " Oh , don't worry about me.. I'm Ok".. But the truth is, I'm not ok. Why am I hiding all this all the way? Carry all the burden without asking for any help...? But come to think of it, it is better that not to tell coz I rather carry it myself instead of troubling people to carry the same burden with me. It will be double the misery....T.T