Could you tell me why internet addiction makes me feel depress?

I don't know: nor could anyone else just from what you have said. Depression has many causes, and the only way to know is to see a mental health professional for an evaluation. You can start with your primary care provider, who may want to refer you on. People DO things on the internet, and that is the problem, not just being on it. Sexual problems, gambling, impersonation of others are all different.