Hello @Scream58
You know what? I agree with everything you said. Life is cruelly unfair. Your post breaks my heart to know that you and many others are living in this way.
I have almost been there too. In many ways, I still am.
What I will not agree with is your opening statement that you are some type of reject, or that you are useless. You are not. I don't have to know you, to know that you are important - as equally as useful & important as every other human, animal, creature!
I appreciate that your circumstances are bleak and have become a greater burden than you can carry. I want you to know that the idea that you think you are somehow worth less than someone else in the world who is apparently capable, is an expression of humility. This proves to me that you are someone of worth & needed in this world.
I think you are saying that you want to give up in reaction to your hardships. I can empathize with that. I don't criticize you for feeling that way. Perhaps it is the most intelligent and reasonable emotional response to the neglect you are experiencing. It is not however, in any way, a reflection of your self worth. Remember that.