Hello Any form of addiction is not good for your brain. You have rightly mentioned that you need to involve yourself in other activities and reduce your time of Internet porn slowly bringing it down zero. You should schedule your day and try to indulge in numerous activities that you like apart from Internet so that these activities does not leave you with much time for it.Also you can exercise or play some sport that you like to release the energies of your body.

You might have to forgo your laptop or desktop at home for some time. You may even need to stop accessing data from your smart phone also. Use a phone which enables you to get connected to the people and to the world only when it is required. You might find a lot of free time every day to be usefully spent..... If possible, do consult a psychologist for a better understanding.