It is not just gambling but everything of which someone is addicted, is not easy to give up. You are the person who can help you at first, you need to make yourself assure that what were you doing till now was wrong and is bad in all perspectives then seek external help. It needs strong will and clear vision driven by inner will and you can get rid of gambling addiction over the time.
Yes it is not easy to give up the things or the hobbies that you are doing for a long time. If you want to give up on it then it takes time i think. If you want to give up you need to focus on other things to divert your thinking skills and the way on how you apply it in the real world.. gambling is very fun to play but if you want ti quit then it is up to you.