I am struggling with it too.
My mum left my dad and left us with him, when me and my sister were 6 and 4. She went off with another woman - soap story or what! I don't remember it though, think I blocked it out. My mum was not very maternal, she set out to homeschool me and sister but was so sick of both of us by the time September came round, she sent me to school!

So dad raised us and we saw mum every weekend. Then 3 years later dad met and married my stepmum...now she was abusive, mainly verbally. She was pretty insecure and saw me & sister as a threat to her and dad's marriage.
I found it very hard to adjust to being a step family. 1 stepbrother, 1 stepsister, 1 half brother and sister. It was hard work always trying to please everyone (which has always, always been my downfall).
Now I am a parent to 8 month old DS I am determined to do well by him, but fear I am not succeeding. I want a cross between my childhood and DP's. Dp has together parents, who were always loving, caring and made sure he was safe (whereas my dad,mum and stepmum didnt care where I was as long as I never disturbed them!), but they fed him rubbish food and let him watch telly all day too which I don't agree with, whereas my parents fed me a healthy diet and I read a lot of books but didnt get so much love and attention...
It's a tough one really - I think we often set the bar too high and that's when we tend to be down on ourselves.
I try and tell myself I will never be the perfect mum but as long as I try my best and DS turns out semi-decent....I've done OK.
xxx