Catch 22. My mother is a raving alcoholic, still is. She obviously had severe mental health issues from before she had children. One of my earliest memories is of her cutting her hair off like a maniac and being sectioned. Long story short, I suffered at the hands of this evil woman, with my father turning a blind eye (they were divorced for most of my life). I have PTSD. I deal with her day in day out. Somedays I scare myself with my own dark thoughts.
I struggle with every relationship in my life; with friends, boyfriends (recently lost my on/off relationship of 11 years) and authority figures. I so crave a 'normal' life. I would have loved nothing more than to get married and have a family of my own. But thanks to my parents, that seems impossible and actually incredibly scary. The really sad thing is, my parents are just sailing along in their merry ways, without any second thought for how I am dealing with their failings - they simply blame each other for what me and my siblings have to cope with.
Although I don't agree with a lot that has been said in here, everybody needs to think long and hard before making a baby. Caring and raising for that baby should be the most important thing you ever do. If you aren't capable of that commitment, get a hamster instead (or an animal with an even shorter life-span if it's really difficult for you!).