Dear Giorgio,
I hear the pain in your post that this addiction causes. It is an addiction. And it feels like we cannot help ourselves. Sometimes we have to take drastic measures to stop this addiction. I gambled in many local venues. In my country you cannot ban from these places!! In the end I chose to tell my family of my problem so they could help me with my money. In the beginning I would provide receipts for any money that was given to me. I did that for a whole year! Over time I felt back to my normal self and was able to take care of my own money. I also went to gambler anonymous meetings for support. And seen a gambling addictions counsellor.
I know telling your parents is a scary thought. We feel shame at what we have done. Guilt for the money and opportunities we have wasted. But you can come back from this. Within a few weeks of not gambling your mind will start to clear. It started as fun but now it can be life theatening. If your parents though this might drive you to a dark place, they would tell you, let us know. They may be dissapointed and upset. But parents almost always just want whats best for their children.
Try the chat groups here or talk to the help line. I know they will have more advice for you as well. Take care, Laura