Did you try taking the enneagram test? I think you may be a type 9, which explains a lot. If so, why you feel so unmotivated and restless makes perfect sense. Type nines have problems with inertia and not fully participating in life. I'm the same way and when I realized why I was like this, it helped a lot. Lately, I've been exercising by going to the gym a lot which helps. You should try it. It helps you stay present in your body and improves overall health. Plus, in order to get moving, you have to have the energy.
Here's some more information about type 9s.
"They tend to avoid conflict at all costs, whether it be internal or interpersonal. As the potential for conflict in life is virtually ubiquitous, the Nine's desire to avoid it generally results in some degree of withdrawal from life, and many Nines are, in fact, introverted. Other Nines lead more active, social lives, but nevertheless remain to some to degree "checked out," or not fully involved, as if to insulate themselves from threats to their peace of mind. Most Nines are fairly easy going; they adopt a strategy of "going with the flow." They are generally reliable, sturdy, self-effacing, tolerant and likable individuals."
"They are easygoing and low-maintainence. They enjoy relaxing and letting their minds wander. They like immersing themselves in their hobbies and are often drawn to the outdoors. They don't impose their preferences and aren't sticklers over little things. They don't need for things to be spelled out. They are good-natured and unflappable. They have the ability to stay hopeful as well as level-headed and calm during a real crisis. Whether they are anxious, fustrated, angry, excited, or enthused, they show less than most people and appear stable no matter what."