When I was young, it would have been playing open mics as a teenager. I wasn't amazing but it's really important to play publicly in order to grow as a musician, and that means kinda sucking in public. I would not have become a musician if I didn't have that supportive community.
In this day and age, if I were to do that, someone would probably live stream it or film it on their phone and put it on YouTube, then It would get found by the kind of awful kids that like to make other people feel awful for no reason, then they would have found my like Facebook or social media or something, I'd catch shit at school, and I never would have touched an instrument again.
So yeah, save your highlight reels for someone else, thanks.