You are absolutely right. It is more comparable to gambling addiction than addiction to a substance. Therefore a different treatment is needed.

And yes, the likelyhood of starting "self treatment" is low.
But is even lower to get yourself up and admit to yourself that you need professional help.
If you are not able to set time limits or follow any other advice, seek help.

Thats why I added the last point:
Be honest with yourself: Reflect on the impact of your gaming habits on your life
Which is probalby the hardest step to take: Admitting that your gaming habbits actually ARE an issue.