Why does my Mother in law hate me so much?

She purposely will talk about things that she does with her other daughter in law (their quilt retreats for 3 days) do together in front of me knowing how much I love to sew and have told her I really want to make a quilt. She told me there are lots of nice ladies who would love to show me how to quilt in my area. Her other daughter in law lives further away then me. She is also using my line of credit (my husband let her) and owes 100,000.00 on it. When we visit from out of town she purposely goes shopping with the other daughter in law and I will be sitting there and she does not invite me. If I say anything to my husband about this treatment he tells me I am being too sensitive and it is all in my head. I have been so hurt that I now abuse alcohol on occasion and then yell at my husband. I have been told that she is gelous of my looks but my other sister in law is pretty too. I come from a broken home but the other daughter in law does not. In fact, my Mom has been married 10 times and has 8 kids from different Dads. I am not like my Mom though. All my kids have the same Dad which is my Mohter in laws son. Am I being punished for my Mom's track record? My Mom in law finds fault in no matter what I do. If I really do mess up she lets my husband and the world know. I will never be good enough for any of them. I am so sad.