I really feel proud about how well I hide my addiction
Do you really have an addiction? Is there a reason why you want to hide it?
A little one, but I am always able to stay focused on things so it's not a problem.
If you think that you're addicted to something then you should try to quit it rather then hide it. Seeking help for an addiction is a good thing and you might want to think about taking that step.
Nah, I can handle it myself and no one will ever know.
Eventually this addiction will become a problem for you. If you wait until it's that far gone it will just be harder to stop. Try contacting a recovery center just to get their opinion.