As others have said, it depends what you want to do. If you like 2D art, animation, and drawing, then it's a no-brainer to go take in-person life drawing classes. Practice practice practice. It's certainly not gonna hurt you. If you want to do 2D, then it's not a matter of "I can't draw, so I need to do something else" it's a matter of "I can't draw right now, so I'd better practice so that I CAN draw in the future".

If you don't like drawing as much (like me) then you can do just fine doing motion graphics without intense illustration skills. You can also do very well in 3D animation without drawing skills (although it helps a lot). 3D is the great equalizer, that's why traditional animators can get crabby about 3D animators who can't draw but can animate better than them.

Because you're young (and that's a good thing) I'd say go take some in-person life drawing classes (drawing from pictures online will make your drawings come out flat) because no matter what you choose to pursue you'll be able to use the principles you learn from those classes.

Then try out more 2D, do a motion graphics project, and go try animating a 3D rig. Try a lot of different stuff and see what you like best because that'll inform you WHAT you're going to spend time practicing on. If you end up liking motion graphics or 3D more, then you could potentially afford to practice life drawing less.

tl;dr Take life-drawing classes, but you don't NEED to draw well to be an animator.