Please help(its rather long) but i really need advice like really really badly?

my parents are constantly mad at eachother and idk how to explain it but like i know im the only reason they are still together i am 100% sure about it. My mom told me this "when youre all grown up ( im the youngest) i wil get my own house and your dad will get his own house and we will be happy." this obviously implys that after me and your dad are done raising you in this horrible angry unstable enviroment and we no longer have to stay together so you can be happy(HAHAHA) we will get divorced and we will be happy ourselves. Okay so well my mom idk how to explain her really i guess clueless would be the best adjetive but add *ALWAYS ANGRY*with the exception around her friends,,, and shes very insecure but would never admit it. When im not wearing any cover up she tells me i should be and gets mad at me for being confident in myself*thatconfidence is fading*, she really wants to get some plastic done but we dont have the money, and she just pisses me off, i cant walk around my own house with shorts a tshirt no make up and my hair not done without feeling horrible and insecure, and if my moms home well then of course ill get a subliminal insult , but she does try ill give her that. And the fact she isnt a good mother in my eyes kills her, but shes not im not saying that out of anger shes just not. Like i said she trys and i thank her and love her for that, but how she parents makes me cry everyday, i mean theres the happy moments where we are dancing together but when it comes down to serious stuff its just plain bad. My dad on the other hand is not the best parent ever but he trys, he is rather carefree, although i know he loves me and he does the best he can he doesn't discipline me, but he does really want me to be happy, and not in a superficial way in a real fatherly way, but he acts like a kid sometimes(as i say this i feel really bad, because i know no parents can be perfect but im just saying what i feel) he doesnt give me structure, and hes really leisure, he is like the exact oppisite of my mom, but the quality i appreciate most in him is how caring and accepting he is. he wants to stay with my mom he wants to put effort in it and sometimes my mom does but my mom wants to for my sake and my dad wants to for there sake. I absolutely hate this they only fight about money and me and ughh i cant stand it i feel like im going to end up bad because i dont know i feel like im going to look for alternative ways to be happy, but i have God so i dont think it will happen im just like screwed up. Ill tell you this i am sad at home and not even kidding probably the happiest person in the world around my friends. Idk what to do i feel so guilty, and angry, and sad and sometimes i just want my life to be over, but not really what i realy want is to fall into coma and wake up and this part of my life just be over. i feel like im going to end up one of those desperate girls cause they say the girls who are sad at home look for happiness in boys, and i feel like im going to end up in that statistic, i pray every night and im not going to give up but i need advice for what to do now and how to handle this in a good way please help me. I love my parents so much and they are the best parents for me, they will make me into the person i am supposed to be and i pray with every bit of me that thats a good person. i wont do anything stupid im a smart girl, but i want some advice how to handle the pain in a positive way. please help thank you.