You will need to get some professional help because I do not really know how to get someone to with with gambling.
That person is going to guide you and you should approach it the best way.
Yes, with the help from well experienced trainer, I too believe one gambler would be able to quit his gambling addictions. But without help from any external help from other people, I mean to say only having self-confident will not help any gambler to come out of gambling in that much easier way.
Yes only your self-confident is not enough for quitting gambling. It is very much tougher task than making profits from gambling. In order to protect your bankroll and to prevent your future losses you need to quit gambling. For that you need to take that pain of quitting gambling to make good cause for your family and yourself.