If you choose a goal that is not worthy enough, you will try a lot to concentrate on your goal but you will find that invariably you get distracted after a while. That is not because the distractions are powerful; that is because your goal is powerless.
The goal itself is a defence against distractions. So, the goal has to be right. Don’t talk so much about how you get distracted; talk about how first of all you have made something into your goal. Are you following a trend, or have you really thought it out?
If you are doing something just for the unadulterated pleasure of doing it, you don’t want something in return; the doing is the return. The very process of doing that thing is the bliss, the return, the reward. Then you will never be distracted.