Like u said u started from fun. All u need to do is to find another fun. Focus on something else that suits u, if u don't have u should search for some hobbies to occupy your mind.
when you're addicted to gambling, it will be really hard to find another hobby because you will keep thiking about gambling
thing you can do, is to talk to others about your problem, like family or close friends, once they'll know about your problem, i'm sure that they will help
TBH, I found out that I could easily quit gambling overnight since I am not addicted to gambling. If you are thinking gambling all the time, but you badly want to stop, just go to sleep. Well, it works for me every time I'm stressed about something.
I'm sure your family, friends could help you, but you've got to help yourself first before you seek help from the others.