I am 16 years old and I have a sister who is 20. My entire life she has made me miserable by lowering my self esteem and getting me in trouble, up until maybe 2 years ago when she moved out. I thought things were better, but whenever I tell her anything personal or she sees or hears me do anything, she tells my mom. Now I feel like i can't do or say anything without her going to my mom to tell all. The other day when she came to my workplace, she went back and told my mom how sarcastic i am with my co workers, even though that's just how we are with each other, nonoffensively. that was the last straw and now I'm furious, but I don't know how to finally stand up to her considering how miserable she's made my life. Help!!