I am pretty stupid and want to become not stupid. I have aphantasia meaning i cannot visually imagine anything so I feel like most normal methods for math don't work on me, and I also have trouble actually sitting down and learning anything since my computer is just right here and I can do literally anything else.

So can anyone suggest some good, engaging YouTubers or websites/phone apps for learning math and science shit? Preferably something around 5th or 6th grade level (yes I am that retarded) that doesn't make me feel like a total retard (even though I am) with dumb cartoons that can work me up to a respectable level.