I've wasted my time with so many people, only to be hurt, rejected and just plain not appreciated. It never stops hurting, even though I am so ridiculously used to it.
Sorry to hear that dude, I know them feels, hopefully some day things will change and people will appreciate your value, don't give up hope and don't put yourself down (which I know is easier said than done)
Surprising you haven't seemed to reach the point of disassociation yet. Because I'm kind of there, have had the same feeling as you once in my life too.
How can you be used to it if you are always hoping again and also it is always a new individual person. It is ok you are a human. Because of that i don't do that much with humans. They dislike me later or so