I'm not sure if you are a practicing Buddhist or not, but if you are and you practice metta.. always remember that we practice metta on ourselves before all beings. Regardless of whether other human beings see value in you or not based on whatever criteria they wish, you are still a being amongst all beings in all the world systems and universes and not better, worse, or equal to any of them.
I agree with others in that people always need their parents in their lives if it is possible, and even if your family never wanted to see you again, is that a real reason to end your life thinking logically? I do not want to make any judgements but It seems to me that you are coming through this post in an emotional manner, which is understandable due to your situation. if you truelly thought about it logically or developed insight regarding it, would it really be skillful or make much sense to end your life?
Ajahn Brahm talks about looking at every situation saying " good, bad, who knows"... you don't know how life will turn out.. and if all this buddhism isn't helping... watch this video... it might help
- this great scene from the movie cast away in which tom hanks talks about how he had no control and couldn't even kill himself.. but he knew to keep living, because tomorrow the sun will rise, you never know what the tide will bring in.