What is the name of this movie starring a young blonde female protagonist?

I saw this movie on in the mid-90s on HBO, it's about the life of this blonde female in her teenage years or early twenties. I only remember bits and pieces like how she is in jail and makes a weapon by melting her toothbrush bristles and placing a razor in them. Also, I distinctly remember her getting into a car with a man and asking him if he would like to have sex, after he pulls his pants down she sticks him in the trunk of the car. Anyone know what this movie is called?