My sister is vindictive towards me....?

im sorry. your sister and you should be VERY close. i know how you feel though. when my sister gets it in her head that she wants to be mean to me (FOR NO REASON!) she'll do it and it hurts. try talking to her (again) and if that doesnt work then maybe you need to distance yourself because otherwise she'll just hate you more as time goes on...like i said before im sorry and i hope that your relationship gets better with her. one day shell grow up and realize that shes missing out on a great opportunity!! good luck!!