Is it normal for me to hate my mother this mich?

When I was little my mom was perfect. Me, my little sister, and my mom were always together. We did everything. My parents were divorced at the time, but we were happy.
By the time my mom got re-married, my mom was even happier. She cooked, cleaned, and was the perfect wife and mom. But by the time she had my brother things got a little shaky. And when she had my sister she just gave up being a mom entirely. She was up till five in the morning, drunk and on the computer playing poker. She was never home to cook and when she was, she'd order pizza. I was 16 and had to mother my three siblings and my mother. I cooked, cleaned, got the kids to school, made my dad his lunches, and nursed my mothers hangovers. On my 17th birthday she left. After stealing $300 dollars out of my bank account.
It's been three years. She calls every now again but I can't speak with her. I honestly hate her. She stole my teenage years, ditched us, and now can't understand what she did was wrong. I've tried to forgive her, and every time I think I have, when she speaks to I hate her even more! Is this normal, or am I just begin hardheaded?