How can I beat my lack of motivation!?!

Yes, I understand this is mental, and I AM LAZY. I admit that and I have tried countless times to do something, such as losing weight, school work, etc. The only thing I can do for hours on end whenever is making music, and studying psychology. I am on Adderall and I have been for 3 months and it works great. It gives me the focus to get done what needs to be done. That is ONLY if I can be motivated enough to do it. I have tried so hard to do this and I need to know how I can try harder. It's destroying my academic charisma.