I can completely understand those feelings. My advice, something I wish I had figured out a while back, is don't rush things. You'll understand them when your brain is ready to understand them. I tried pushing myself to learn to use Direct3D a few years ago, and man, my brain wasn't ready for it. I would read through the documentation and follow tutorials almost every day. Each day, I'd spend about an hour and a half like that, then need a 2 hr power nap. Turns out, I needed to learn a few more things to be able to comprehend what the hell I was reading and doing. One day it just clicked and I started comprehending more and more.I really just want to press on, so I think I am done with it!
When you reach a certain point in the tutorials and you don't know what is going on, you may need to stop watching for a bit and practice the concepts that were taught up until that point. Watch the video(s) that gave you trouble. If you still have troubles, ask here on the forum or google the concept being covered. Perhaps someone out there can put it in words that you might understand. That's something I've noticed, is sometimes it takes hearing it put differently to make it click.