It sounds like you've been learning the techniques but forgot about the art. That is to say you know the steps but there is this je ne sais quoi that feels missing.
I'm no drawing savant. I don't know everything. But what I do know is that there is more to drawing than just technique. Maybe what you need is a little exploration into the theory side of things, the philosophies, the visual aesthetics and grammar--the history
All art making has two sides to it: how it's made and the reasoning that goes into that. Greeks refer to it as techne and empeiria. Techniques are easy to learn, but the other stuff not so much. The other stuff, the reasoning behind your choices to guide those techniques, comes from a lot thinking and experimenting. History is full of people thinking and experimenting about art.
So a little art history might help. (It's the most neglected "fundamental" of budding internet artist today!) I would focus on the art history you might be particularly interested in. I would also look at historic works by artists who wrote about theory, again go after those who interest you the most. Judging from your samples it appears french animation may be up your ally or maybe some UPA. Cartoonresearch.com may come in handy.
The point I'm trying to express is that you shouldn't let the formulas and methods do the thinking for you when you draw. That will lead to dull, mediocre, unintresting art. Start to look into the reasons why something looks good. Don't just focus on how the execution was made, look at the why it was executed that way, for what purpose.
P.S. Don't listen to the asshats telling you draw realistically first. Those idiots are speaking from a place of prejudice and misunderstanding. Styles of art, forms of expression, don't come on a sliding scale. There is no one-way-fits-all-others. That's retarded. Use what's works, if some good ideas come out of realistic drawing then so be it. But don't let it dictate your thinking*, that just kills the art.
*especially if you don't intend to make realistic work.