Ask HN: Marketing My App to Middle Schoolers/High Schoolers

I am a 16 year old developer who recently completed a fairly impressive app (I think) but the market is young. The app is called Truthly and it allows anyone to easily create and join a "Truth Is", "tbh" and more. If you don't know what those things are they are quite common posts on instagram and then your followers like the post and you send them a text saying "Truth is your funny" or "Truth is i haven't seen you in forever!" and things like that. Anyway it is quite popular but also very complicated . This app makes it easy to create them, supplies you with some cool images and you can request/read your answers with the app! So far I have had a lot of positive feedback and over 100 users (though mostly just in my high school). I think it could be very popular but I am unsure of how to market it to the target audience of 11-17 year olds. I would love to hear any ideas! Thank you!