I think it's important not to look at the problem in isolation. Your fixation on superficial things your mind races with must be considered in correspondence with your lack of fixation (focus is a limited resource) on your inner state of awareness and how you really feel about yourself, situations you're in and surrounding reality.
There are many reasons why this could have happened. If you're repressing some material in your past then you have a highly false conception of yourself because you're fundamentally disconnected from the reality of who you really are. If this is the case, I would not recommend abstaining from all entertainment, because you wont be prepared for what you'll be left to see in the silence and stillness that remains. Rather, I would recommend coming at it from the other angle: when you happen to not be indulging in entertainment, engage in serious self-introspection, with extreme passion and conviction in your efforts, and as you make progress then you'll want to indulge in entertainment less.
On the other hand, if your obsession with entertainment stems from a mere lack of having been taught to gear yourself in life towards more important things, in this case then I would indeed recommend a certain degree of abstinence from the entertainment. Even in this case however, you still need a plan of action for what you'll do to fill all this newly-realized free time you have on your hands.
So whether the former or the latter scenario is at play--or, as is mostly likely the case, a combination of both--it's imperative to read a fuckload about all sorts of things, get ton of ideas and hypotheses to try and test. Expand your intellectual horizons, on subjects relating to your immediate existence and consciousness.
There are many strategies to help you with this difficult task, and I cannot explain them all to you here, which is another reason why you must expand your intellectual horizons and acquire more knowledge (knowledge is power). For example, one strategy could focus on your desperate, unequivocal intention and desire to stop listening to so much entertainment and to stop thinking so much about shit; this is close to my view as in my paradigm I would council you that the reason your mind is racing is because you WANT it race, more than you want it to not race, it's as simple as that. In this case, the strategy would be to indulge in your entertainment and racing mind so much (and, please, if possible, with some degree of stylishness and respectability) that as a result you become completely satiated and disgusted with it that you come to truly, fully want a legitimate release from it [note: you must be mindful in your indulgence of it in order to truly perceive its hollow, unappealing nature, but this mindfulness doesn't mean you can't have fun with it at the same time; you can allow yourself / choose to be on that level for a while]. Conversely, the opposite type of strategy at the other end of the spectrum might be to pray and have faith and try to surrender your desires for a higher power to steer them in a more positive direction. In between and around these two diametrically-opposed strategies are countless others.