She's Come Undone - Wally Lamb. This is a good book, a long book. I read this as a freshman in college.
Are You There God? It's me Margaret - Judy Blume I don't think you can be a girl in the 1980's and not read a Judy Blume book. I read this in 6th grade and read a few other times.
Alphabet Series - Sue Grafton. I love all Sue Grafton's books. I started with M in high school and loved it so I went back and started with A and haven't stopped since. I have caught up and have to wait each year for her next book to come out.