I am no longer attracted to my girlfriend

Hi, 32M here. My girlfriend 35F is currently overweight. She was not like this when we first got into a relationship. She was 180 pounds when we first start dating six years ago. Now she 337 pounds and gaining. Now I will mention that she has a slipped disk in her back. She was bed ridden for six month about two years ago. Also she reslipped the disk not to long ago. She has been trying to lose weight by eating healthy but that doesn't seem work. Also she has thought about the "Band" around the stomach or doing a weight loss pill. That is one of the reasons why I don't. Second is that she got cats and I told her I didn't want them in first place. Now I am stuck feeding them/cleaning up their poop. Thirdly, she has two kids. They were B1 and G7 when I first came around. Both are 7 and 13 now. Honestly, I understand that I that I will never be their father. Even though I try to treat like my own. The problem with them is that I try lay down the "Law" in the house and they go straight to their mom. I don't feel like my voice is being heard. I don't feel I have a say anymore and tired of cleaning up after everyone. Not to mention the fact. Sorry if this comes off as rude/crude. I don't want to come home. To clean the house. Yet it still ends up being dirty then I have to deal the house smelling like cat pee. Honestly I didn't live here it would like a episode of hoarders. The room we stay in looks close enough to it. The best of this when I try to clean I have to get permission to clean from because she doesn't want me throw anything that is valuable. Yet it seems like she has a hoarding disorder. That is my rant. How I feel about living with her. I love her as a friend but I have no choice because I am not doing better myself. Thank for reading this and I will answer any questions you have.