Although I’m about 40 years older than you – that sounded like my story.
The first thing I realised was that I was in the grip of a powerful addiction – and I had to take it seriously. I couldn’t ban myself from places (that is more recent than me) so I moved away from my “haunts” to a new town. I made it difficult to access money and I kept myself busy. Evenings I went to GA meetings and at weekends I either worked or found courses to do that took all day. I tried to be as “compulsive” about my recovery as I was about my gambling. I had relapses but they became fewer and fewer and eventually I stopped – not sure exactly how long but I have been about 8 years free of my poison.
I was not a “bad” person – it was my behaviour that was bad – and I needed to work on things like my low self-esteem and issues from my past – anger etc.
Of course I can’t say if I will ever gamble again or not – I feel far away from it at the moment. I still keep away from all forms of gambling in case I have a lapse – but I feel that is only like a person with a strawberry allergy avoiding the fruit. Others can eat – but not me. I hope that helps. I wish you well.