Well done on taking the first step – ie admitting to yourself and us that you have a problem … You now need to take some practical action in order to stop – these include, banning yourself from places where you can gamble both online and off; carrying as little money with you as possible – if you can getting someone trusted to handle your money for you. Getting local support through counselling or self-help groups such as GA; finding new ways in which to spend the time that you would use up gambling.
It is a long road, it took me many years to stop – even after I had admitted I had a problem, but I have been clean for many years so it CAN be done. I wish you well.