Do what you want and dont stress about it. Your going to have tons of interests and even "passions" as you grow up. Maybe drawing just isn't your thing. You don't have to do hobbies on a regular basis and you can still keep them.
As for getting motivated again. This is what i do. Just start randomly drawing lines on a sheet a paper in random shapes and shade them radomly. If an idea pops in your head of what to draw go with it without question. Or just continue making random shaded lines until you fill the whole page, then move on to the next sheet of paper.
I look to my favourite artists for inspiration/motivation to draw ouo. a kind of, 'im never going to be as good as them unless i give myself a kick up the butt :I' kind of deal. Then I pick an area that maybe im not so good at, hands for instance |D, or something completely out of my comfort zone like anthros, maybe they dont turn out perfect.. but because theyre not perfect it gives me the motivation to practice them until theyre up to standard, y'know what i mean ;w;? If none of that is helping, take a few requests, that sort of forces you to start drawing again since people will be waiting for their art. most of the time its best not to force it though. im rambling, hope at least some of this helps c:
I know that for some people, the desire to draw comes in ebbs and flows. I have gone months without really drawing and then have had a period where there is nothing else I want to do and this feeling can last for another few months as well. Sometimes creativity needs a break. Doing other things can be good for the process.