Can someone

please explain to me why it sucks after you constantly try your hardest but you get nothing in return. well what i got in return really hurt, like something important has been taken away, something i'll never get back. why do i feel that im so un important, why i feel like im a complete stranger to people now. why i feel that i should just give up on everything. why its probably better for me to remain alone, like how it use to be for many years. why,why,why,why. what am i doing,seriously.