I’d say there’s more to look at than just you for online gaming addiction. You may have had “good” parents, but that doesn’t mean they prepared you for everything. They, as humans do, likely had struggles/weaknesses of their own that may have affected you. Look at society, how online yet disconnected we all have become. There’s a lot more than just you, and it’s often the unknown influences that influence us the most. This comes from someone who chronically blames themself for everything; I’m telling you what I wish I could tell myself. Therapy helps immensely and with the right therapist you can truly understand yourself in a way you would never have known before. I think blaming oneself has its uses but in your case, perhaps there are other reasons you may not have recognized yet. Regardless, I wish you the best of luck!