To move or not to move

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I am 21. I have a fulltime job. I've come back home after studying. I have a friend who wants me to live with her and her daughter. Should I stay home and save for my own house or move out with the friend? At home I can save almost all my income and have more than enough for the deposit on a house and be able to cover the mortgage alone easily in less than 4 years. But I'd have to put up with my controling mother and her wacked out favouritism amongst us kids. Moving out I wouldn't have to deal with a crazy mum and pretty much be able to live peacefully. But the catch is the 1yo daughter 4 days a week plus I'd have to come up with the deposit on my own. As well as my friend isn't the best with money and undoubtably I'd be covering rent/bills every now and then. also my saving capacity would be so much reduced I'd take about 8-9 years to gain a decent deposit. I don't want to live alone as rent here is insane and at my current income I'd be unable to save anything past a tiny emergence fund. Should I deal with crazy mum in order to be able to never ever move back. Or should I move out with the friend and have the chance of moving back in?