On Friday, the Interstellar actress posted a picture of herself as a smiling high school student, but she says on Facebook that she actually had a "very difficult time in high school and missed too many days."
More than just the amazing throwback photo, Chastain, 37, says, "I wanted to share this info because I think it's important to know that you can always change your path in life. I am a strong advocate for education. I don't believe that I would be where I am today without the education I eventually received."
She then offers words of advice, "So those of you having a difficult time, please don't leave school. Stick with it and find a class that inspires you. Be proactive in your education. It changed my life and it can change yours."
Check out the video below to see Chastain, Matthew McConaughey and Anne Hathaway take ET's space quiz.