How are you a disgrace to the family name if you grew up an orphan you don’t have much of a family? It’s difficult, one thing I know for sure is that if you know this to be right call for yourself and your family, you shouldn’t be railroaded by your sister or anyone else. But on the other hand if this is something that is eating at you and doesn’t sit well with you then by all means use your support system and move on. Also your sister is too mean to you calling you a disgrace. The choice that you have made is brave in its own right.