How to move away from a controlling parent?

I would like to start by saying that my mother isn't as controlling as many of the others I had read about. She's just controlling enough to make my life empty and feel very pointless.

Due to the text limit, I can't tell you everything but I'll give you an overview. I'm in a constant state of cleaning, even though the house is spotless, according to everyone but her. I only get to spend a few hours with my sister once a week. I am a serious gamer, but I only play twice a week for an hour and even then she accuses me of being addicted. I am forced to get my nephew from school 5 days a week even though it's clear neither of them ( as in my mom and his mom) want to do it, which means after I get off work I can't do anything else. Due to my extreme seclusion I have no friends (literally) thus no possibility of a roommate. I have never had a boyfriend due to my lack of friends and she keeps trying to set me up with people who will make me more like her. I'm 22 and make a little over minimum wage, but not enough to live alone since I work part time and have class

My sister is helping me to move out, she's letting me move in with her, I tried it once but I still love my mom and she used that against me by guilting me, and now I want to try again. I'm scared that I will fold like I did last time and so I wanted advice on how I should approach the subject again. Also, should I wait until I'm finished with community college at the end of the year, or try to do it in a few months?