Alcoholic mother.. im 13 ?? please help:(?

helloo im 13 and a girl. Sorry if this is long, but i just really need help. Well my mom is 49 and she has been an alcoholic ever since she divorced my dad, so for maybe 8 years. Well, she is a type 1 diabetic and she also smokes. And this is really really difficult for me and my brother(19) and my sister (22). Welll my mom ended up gettting remarried to a man with 3 kids. And both of his kids are screwups and they do something wrong ever day, such as stealing my moms credit card to buy tickets to a weed festival, etc. Anyways. They have made her even more stressed out so now her problem is ever worse. It is soooo hard to just watch ur own mother completely drunk by 2 in the afternoon. I feel like everyday im just watching her slowly kill herself and im not doing anything about it. She is going to die, soon. There is no way she can handle all of that alcohol on her for being diabetic and nicotine addicted. guys, shes gunna die.... Trust me, me and my family have tried everything we can. But i feel really bad about this, but I almost want her to die, because i feel like life would be better and easier without her. All she really does is cause sooo much stress and anger in this house, I also have really really bad anxiety, i have an anxiety disorder most of it caused by stress from her. She is absoulutley miserable, she would be better off in heaven. I feel like we would be happier, i feel terrible saying this. but i feel like its true. is this wrong of me to think?? i feel bad for saying it....:/ anyways. what on earth should i do? Im confused, i dont wanna see her kill herself with alcohol cuz its just sooo painful for me to see, i dont even consider her a mother to me, shes always drunk and she makes no sense and she is sooo embarsing....i dont even invite friends over cuz of her. I try to tell my friends and ask them for help, but they honestly dont care, cuz its not their mom so why sshoulld they care? It hurts me....bad. Someone help me, im confused about everything, im confused about life. the only upside is, im COMPLETELY against alcohol after ive seen what it has done to her. And my sister is a big party person, so one time she came in my room drunk from a party and i just starting crying because i saw her drunk and i love her so it made me think of my mom. And my boyfriend told me he tried drinking one time, and i starting crying my heart out because i dont want to see anyone else i love get hurt from this terrible alcohol. its really affecting me.