Is it normal to dislike my mum so much?

I don't think I hate my mum, I just dislike her a lot sometimes. Sometimes we get in quite well and act like friends but usually this is for an hour tops before she starts something off. She has depression and is a recovering heroine addict. She's not your typical junkie and up until a few years ago she was a good mum. But the past few years we've grown apart, she's had multiple scum bag boyfriends living with us who she's known a matter of weeks. She's been to rehab twice and always tells me how awful my granddad was when she was young. I'm really close with him and I don't know where either of is would be without him. I think she's deluded with a lot of her memories. She always puts down what I do. She says she can do it better, or I'm not doing it right. E.g the other day I was holding my friends baby, I'm not a mother I am 18- I can hold a baby but like most people I'm slightly wary that I don't drop someone else's bundle of joy. She had to tell me how awkward i was being and how the baby knew. she always says how horrible I am, how I make her want to kill herself and how I don't help her out etc. funny thing is she's in bed for days on end or at rehab and I look after the house fine. Everyone I know thinks I'm nice just a normal person but she says I'm evil. I feel like I can't be angry at her for being an addict and for not having a job for years because of it and she puts pressure on me about bills etc. when my boyfriends round she plays us off each other and points out what I'm doing wrong to him (I don't do anything. We are very happy together) she says things like "you shouldn't jump when he says" when I stay over at his place. Whe starts arguments all the time and won't give in until I blow up. She's slapped me and not let me leave the house to avoid a row but I'm the one who's in the wrong always. She says things such as " you should see how people look at you when you speak to me" although everyone who knows Us both says she's very belligerent towards everyone. She forgets about all her sh***y choices and always tells me how bad a person I am. I just hate her half the time and I can't even begin to write down half the things she does.