PastMe
I recently learned about this website, FutureMe, where you can write letters to your future self. What if there was one you could write to your past self, called PastMe? Obviously, not to your actual self, but you would specify what teen angst you were addressing, how you feel about it now, regrets, advice, etc. Did you fight with your mom a lot? Are you BFFs now? What caused the change? Did you cut ties with her instead? Why? Do you regret it? And people could search by relevant topic (i.e. rural small town, alcohol, parties). And since you’ve been through it specifically, you could speak their language in a way that parents can’t, encourage them or show them what mistakes can cost them if they continue down that path.
Does that exist?