I don't want my alcoholic mum to be in my or my sons life anymore!

My mum has been an alcoholic for 21 yrs, I am now 25 and have FINALLY had enough! Growing up I was extremely embarrassed by her, I used to be shy, had no confidence & even my "friends" used to tell everyone at school! I used to think that having an alcoholic mum defined me but as I grew up I knew I was going to be better, I moved out a few years after my parents split which at 17 was daunting. Still at school and paying bills I grew up fast, my dad and step mum taught me to be a better person like a mum Id never had. I believe my mum had a poor upbringing but I only want the best for my son like any normal parent so I've never understood her & felt a constant need to fix her! She's currently drinking at the moment and has been for 3 weeks straight, I just can do this anymore and don't want my son to see it either. It sounds awful but I really do think I would have a sense of this ending if she wasn't here & to be honest I have no idea how she still is with smoking and drinking vodka combined! Im currently looking into doing a nursing degree and just being a happy family, I just feel I need to cut her out or I'm never going to be able to move on... 

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