I feel stuck in my current living situation and don't know what to do :/

Ok, so kind of a rant here and maybe slightly disorganized, but here we go.

So right off the bat I want to say that I'm the kind of person who goes out of his way to avoid conflict.

As the title states, I'm in a situation that I'm really really tired of but feel stuck in.

I live in a 3 bed 2 bath house that is owned by my parents. I live there with my cousin, his wife, and their three kids age 3, 2, and a 6month old. We are all aged 24-26. I let them move in with me over a year ago when they could afford rent at their apartment any longer. I honestly didn't want them living with me but felt bad because my cousin has been one of my best friends since childhood and he didn't have any other options at that time.

The kids currently live in one room while my cousin and his wife live in the master bedroom. I live in the back bedroom. They pay 2/3rds of rent and I pay the other 1/3rd.

I feel like they have taken over the house besides my room. I have all of my belongings in my room because the kids will get into/use/ruin anything left out, so I bassically do everything in my room and stay in there all the time except to make food. I have no food in the fridge because it's always so full of their stuff and it's nasty and my stuff will get used if left there. The house is always really messy and smells horrible because all of the trash is left to pile in the kitchen, 95+% of which is theirs. They don't even take it outside, I have to do that if I want it gone. They also want me to pay half the expense of getting rid of said trash. I never want to have anyone over and wouldn't even imagine trying to bring a girl over. It would be so embarrassing.

The kids are also the loudest kids I have ever met. All of the time.

I don't make enough money right now to get a place on my own and haven't had any luck finding another place to live with roommates.

They don't have much money either and are usually late on rent/utilities.

I want to leave and live somewhere else or have them leave but neither seems like it will happen any time soon. Plus, if I was to leave they couldn't afford rent alone and would have to leave and be in the same situation with no place to live. I would feel very guilty if I did that. But they won't leave on their own probably for another few years due to money issues.

I love my cousin and his family but absolutely HATE living with them and I'm not sure what to do at this point :/

Anyone else here delt with a similar situation?