I loved the nostalgia of reading the pony books thread. I graduated onto teen reads at about 13/14, and wondered if anyone remembers these:
Sweet Dreams romances (American, mass produced, total hokum but strangely addictive)
The British version of Sweet Dreams, which I think was called Heartlines. The setting was a bit less glamorous but the basic idea was the same.
A trilogy by Francine Pascal about a selfish, bitchy girl called Caitlin (think her bf was called Jed)
Sweet Valley High - obviously.
And then there were individual titles that stood out :
A Fortunate Few by Tim Kennemore
Second Star to the Right by Deborah Hautzig
The best little girl in the world by Steven Levenkron
The Cool Boffin by Pete Johnson
So many more. Great times for teenage readers.