Hi polkadotpixie - I don't believe I've ever met you before, but welcome to PC.

You are not a bad person. Sometimes people just need to know that someone even remotely feels the same way they do. If, however, you had caused your sister's problems that would be a different situation - but seeing as her current problems have nothing to do with you --- I KNOW it is not your fault and NO you are NOT a bad person.

Have you talked to your family or your sister about how you truly feel? They may react negatively, but at the same time they may begin to understand how the way they've treated you in the past was hurtful and should not have happened.

*hugs* Please take care of yourself.