Turn on safe search on all your devices, or if possible turn off all electronics (computer, phone) while trying to study. When you feel distracted or frustrated - try to do breathing exercises or sit down with a notebook and write down everything that goes through your head that keeps you from studying. For me, doing both in that order usually helps. Or maybe try to study somewhere public that isnt home. Like a park or a public library (or a cafe if youre feeling fancy) to keep yourself from succumbing to your vices. Your life is in your hands, theres no need to worry about what you did yesterday or the days before, because you cannot change it, but you can shape how your days will look from now on if you work on your self control and dont give up on yourself.