((shez))
You seem like a very loving person. Many people would run from someone (be it their relative, friend, or a stranger) if they learned that the person in question had antisocial personality disorder. The fact that you are willing to look beyond the label (especially given that your sister has shown you very little love) is extremely commendable.
The world needs more people like you! Unfortunately, you cannot control your parents' actions and attitudes, nor can you travel back in time and protect your family from all of the painful trauma. All you can do is continue to have compassion towards your sister and attempt to forgive your parents. And be gentle with yourself! I hope that you find peace soon.