I'm under 18, these are my stats and how it began. (turned 15 a month ago)
3 years ago I learned about Bitcoin but never really used it until 2014 when I was using Minecraft to make money. I made a few hundred and used PayPal, got it exchanged to Bitcoin. I went to hackforums and learned about gambling. On the day of my 14th birthday, I gambled my $500 on satoshimines. Got it to $790 but I lost it all, I was pretty much crushed, that was huge to me at the time. Since then I moved on to bustabit, PrimeDice, BetKing. My first huge loss was $1.4k on Rollin.io when I went all in. Next was a 4 BTC loss on BetKing.io. This year I've lost over $20,000. $7,000 was gambled and $13,000 was stolen from me on a gambling site but I don't want to start shit so I won't mention which site.
This is why you shouldn't gamble. It's crushed me, if I didn't gamble I would have been over $30k AUD richer and probably had over $500,000 by the time I turned 18.