Ditch teachers and learning. Draw whatever interests you: tits, cocks, trucks, old boomboxes, celebrities. Don't focus on creating but use drawing as a method for you to see better and looking at things more carefully. If you develop as an artist, that will be a bonus, and you'll develop into an artist of your own kind. No need to force or motivate yourself into learning. And if you lose interest, just change a subject. Don't treat art as a discipline.
Try to draw the same thing more than once. For example next day without seeing your older work. You'll be amazed of how your drawings get better and better.
It's weirdly left slanted but actually better than my normal handwriting.