DEAR ABBY: I have a very toxic relationship with my older sister. I still live at home, although I’ll be leaving for college in a few years. Abby, she has been emotionally abusing me for years. It got so bad at one point that I considered suicide. I don’t believe I would ever go through with it, but it scared me. She makes sarcastic comments about anything from my weight to what I want as my caree…