Managing your thoughts

So I am currently working through the program how to feel better and the question that keeps coming to my mind is that I read somewhere that since there are so many thoughts that run through our my mind it is nearly impossible to manage them all, is it more effective to just worry about your feeling frequency and trying to change the state of your feeling instead of trying to manage all these thoughts? Im generally interested in your opinion on this not trying to stump you or anything im just curious. Its funny cause something I deal with is low motivation so Im always trying to find an easier way to do things!