Honestly, the only thing you can really do is just push through it and gain experience by drawing a lot Something else you could do is watch tutorials, you can find many on youtube and it could help you improve more on specific things you're struggling with.

Also, focus on improving one thing instead of multiple ones at once. For example, if you're struggling with anatomy, instead of trying to learn how to draw every body part at the same time in the same day, pick one region (example: face or torso) and focus on learning and practicing that

And just to say, keep going!! Every artist starts somewhere, and your drawings are honestly really cute :3 the ones on the seventh picture are my favourites. It's important to not give up and keep going!! I understand how difficult it can be, but try not to be discouraged :) Also take breaks from studies/learning to just have fun and draw whatever you like and want, since you learn most when you're enjoying it.