Who would ever care if i left and never came back?

Im sitting here thinking about why no one ever cares about me. I do so much for so many people and yet when i want something i never get it. I give and give and yet when i have a responsibility i feel as if i was being replaced. I always think that if i was not here how they would feel. I know several would be sad, many who would cry, but only a very few who would actually care. I cry, laugh, and get mad. I have feelings only because i am human and yet most ofyou never even ask why i am upset. I wonder why i give so much, what do i get in return? pain? tears?...is that really how i want to feel?
I know people say that they love me and they forgive me for those things i have done wrong...but no matter what it seems as if I am never forgiven. I am being replaced and i am okay with that...as long as they know how to treat you just as well as i did. I was a friend, a sister, a cousin, and always there for you. NO matter what happens i will be here...but if you want to replace me with another person...i am okay with that...as long as you know what your missing! i am not always going to be here... But i am always going to care about you.
I look in the mirror and i see a lonely, hurt, and empty person...there is no more for you to do but replace me...only because that is what i feel is going to happen. You spend your time thinking about the other person...you spend your day with that person....when you are with me it only hurts because you only talk about the happy times...im sorry for wasting the years we have had together...and the long time we have been friends...
I just dont know what to say...you mean so much to me...and yet i feel like the lonliest person....Sometimes i wonder if you even care....