This post is part of our weekly "secrets" series with Whisper, an anonymous social sharing website.
When we put on our backpacks and walk down those familiar high school hallways once again, most of us have stories for our friends and classmates about that awesome Eurotrip or sweet summer romance. But is it the whole story? Sometimes the biggest experiences and revelations of the summer remain untold. But what happens in the summer doesn't always in the summer: Whisper users are opening up to share their biggest end-of-summer secrets with us -- the good, the bad and the heartbreaking.
Click through the slideshow below to read what these students have to say, and tell us: what's your end-of-summer "secret"? Share your stories in the comment below, tweet @HuffPostTeen, or head over to Whisper.