You’re certainly not alone in being drawn to the internet:
It sounds like you have already employed some strategies to limit internet use that are working for you. It’s my opinion that it doesn’t matter how you’ve made the change, but that you can successfully accomplish a goal you outlined for yourself. So, internal self-control may not be a necessary goal in this area, or even a realistic one when you have ADHD.
Rather than viewing this as a weakness, build your self-esteem:
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism