Why do I feel so worthless and unloved at 21 despite everything?

Yes, I am worthless; truly worthless. I have no human worth; I do not even have the value of an object. If you were to place me somewhere as a flowerpot, I would have no value even then.
I’ll be turning 21 in December. I’ve never had a male best friend. I’ve always hated guys who were friends with girls—because they could be friends with them, whereas I was treated like an animal; and even an animal has a certain value.
None of the men I loved and valued ever loved, valued, or respected me; they didn't want me and cast me out of their lives.
I never got to experience the excitement of being a young girl; a huge part of my life was stolen from me, while those who stole it simply went on with their own lives as if nothing had happened. I was the one who paid the price; I was condemned to a life filled with my own pain and forced to carry this wound forever.
Why do I feel so worthless and unloved at 21 despite everything?
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