I'm 21 years old paying 100% of my moms bills but want to move out
My mom has been unemployed for about 4 years now, but I've only been paying all the bills for about 2 because she had some savings built up that she was living off of. I never agreed to pay for all of her expenses and was basically thrown into it when she ran out of money. I wasn't too worried about it at first because she said it'd be 6 months max of her not bringing in any money. Fast forward to now, I'm still swinging all the bills and living paycheck to paycheck, Over two years, I've been frugal enough to save money so I can get a place with my friend. My mom has known about this for over a year and my hope was for her to figure something out so I don't have to leave her high and dry. She talked a lot about getting a job to swing her end of the bills but never ended up getting one and eventually just started guilt tripping me and trying to convince me it was wrong for me to want to go out on my own. We're supposed to be getting a place towards the end of July but I've been having a lot of hesitation due to her not having any income. She chose to stop working due to her applying for disability and I've floated her all this time hoping it would go through and frankly I'm tired of waiting. It's nearly impossible for me to save any money and because of that I don't have a car. My hope is with a roommate paying their half of the expenses I'll finally be able afford one. My friend and I are also coworkers which means rides to work which is a plus as my main form of transportation is Lyft/uber. On top of all the financial stuff my mom and I have just never gotten along well, we had a pretty rocky relationship in the past and I know it'll be better for us living separately.
I really want to move out but I just don't know what to do, it stresses me out thinking about leaving her but I don't know how long I'll be stuck taking care of her if I don't. My sister is 34 years old and lives nearby so worst case scenario I know she can stay with her, but she's been unwilling to help out in the past two years and can be very unreliable. Everyone in my life has told me I need to think about my own future and stop worrying about her but I can't help but feel guilty about it.