Sounds like you want to do well in school, yet you also find school useless and boring. Sounds like my high school experience!

In fact, this whole story sounds like my early experience with personal development.
Have you learned about the concept of "ecology" in NLP yet? (Btw, Tony Robbins completely misunderstands this concept.) Ecology is the study of how things connect, whether global ecosystems, personal relationships, or even how changing one habit affects another of your habits.
I found that studying and practicing Tony Robbins in particular hyped me up, got me excited (i.e. "motivated") for a short time, and then I came crashing back down again. This kind of "motivation strategy" lacks ecology, it lacks a long-term sustainable orientation. It has negative side-effects.
Lack of ecological thinking makes your changes short-lived. The same is true of our economy, where here in the US we are in a self-created recession due to short-term thinking and structures that encourage that kind of thinking.
Getting pumped up and then crashing ends up creating a vicious circle. Watch a video, get pumped up, do a lot of stuff, crash, feel depressed, purchase another product, use it, get pumped up, etc.
The way to get out of this vicious circle is to find another way to do things that doesn't require getting pumped up, some way that is focused on the long-term and sustainability.
I found that in the methods of
Core Transformation, a powerful process that emerged from NLP, but you can also learn ecology by asking the question "does any part of me object to this change?" anytime you make any small adjustment or change in your life, and then actually integrating (not dismissing or pushing away) any information you receive.
Making precise changes instead of intense ones is also a useful premise. Adjusting the subtleties of submodalities instead of cultivating mania often leads to more lasting solutions.