Everything you want to do or become in life is about the sate of your mind, you can control anything you want to control, therefore becoming a responsible gambler is a decision you can make by stating rules and that will help you stay disciplined while gambling. Though it's not easy you said, it comes with a lot of work to put because you definitely you will be tested at some point to do things out of control, I assure you, especially when you encounter a huge lose.
Gambling is something you made up your mind to start doing in one day I think you are right it takes your decision to decide the way you want to continue doing things either gambling or other things. Your ability to make good decisions determines how far you can go in life and the things you consume in your mind is also a function of your decision. Becoming a good gambler is possible becoming addicted is also possible but you can decide what you want to do if you make up your mind and decide not to cross a certain amount in gambling when you want to fund your account you won't fund beyond that limit.
Not in gambling alone, in life, if you want to become a responsible person you will have to learn how to take decisions by yourself and continue to learn how to take the responsibility of your decisions. Once you get used to doing that, it becomes easier for you to apply it to your gambling games. Gambling will always find a way to test your patience and play around your emotions particularly when you are chasing your wins or when you think you are losing but that's where your ability to take your own decisions sets in which includes discipline and self control. In gambling, two things mostly happens to people. The first one is either you decide to play your gambling games responsibly by ensuring that you discipline yourself and limit yourself to the realities behind it or secondly, by letting the game play you which means instead of you to control the outcome of your games, you allowed the game to control your decision making process