I went through something very similar at your age. A win made it stick around in my head, and even when I wanted to stop it never really left.
Losing money can knock your motivation and mood hard, so feeling low right now makes sense. Opening up to your family was a strong move. Therapy at university helped me, but the reset really started with taking things one day at a time, not trying to fix everything at once.
You are not behind and you are not broken. Wanting to stop at 19 already puts you in a better place than many of us were.
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