It sounds like you might want to try to better define for yourself why you're trying to learn what you're studying. Without good reason to focus on what you're trying to achieve through your studying there's probably very little feeling of reward for doing it. Maybe developing reasonable goals for what you would like to do with C/Python will help you focus on gaining the knowledge you need to accomplish your goals.

If the documentation you're reading isn't satisfying, maybe try finding projects online related to what you hope to accomplish, and start there. Try reading their documentation and code, and then read C/Python documentation to figure out what the code is doing when you don't understand.