WARNING: BORING WHINY QUESTION.

Well, I can't learn when I have a foggy mind. I can't even keep up with a youtube video, I have to keep scrolling back to where I lost track, or if it took me 2 or 3 revisions to memorize a topic, it takes me 5 or 6 now. My critical thinking has rusted so much. I just wonder if it's because of my depression or if I'm growing old at 23 xD or if it's a seperate problem because I've sensed it strongly and I don't want to be neglecting this cuz I still have to face a couple exams over the next year, and the time until that exam is filled with intense learning.