I am a noob at chess

wrong

I'm stuck at very low rating. I play chess for half a year now, and no improvement.
I have known the chess moves since I was in kindergarten.
I study some courses, but the hardest thing is to get back to 400 where I started when I registered. 
I guess it's very mathematical game, and I'm too dumb for that endless mathematical equation. 
I am a humanities scholar and artist, and when it comes to these kinds of mathematical cognitive matters, I have about as much brain function as a baby.
I will never understand, how people have the supercomputer brain to play this game, and improve, with watching a tutorial and boom level 1000. 
99,9% of the population can do it. I'm the exeption.
There are some things in life which some hobby is not your thing, your brain does not meant to do it. Like i play guitar, and bass, but I cannot play the piano. But I can learn the piano, if I invest time in it. The game of chess is an exeption.

chess isn't that mathematical, sometimes you got to count like how many attackers/defenders are on a certain square but that's it, at least as far as I know. Also I started playing chess and I started around 200-300 elo, honestly someone's elo is just a measurement of how much time they have put into the game, any 2000 by what I have heard say they got there mainly because they are obsessed with chess. Its takes time but getting over the 1000 elo gate isn't impossible. If you need help on getting over that gate I can tell you what I did but I am a firm believer that anyone with a sound mind can get good at chess.

Ratings go up and down. It's not worth spending a second worrying about day-to-day fluctuations. You should work on becoming a better player. Your rating will automatically reflect your new strength

Do you review your games? I find the Analysis feature (not the review) very good to grow, because it shows you what your best move would've been in every situation.

I'm sure you can get out from 400, that's a very low rating, honestly. Anyone willing to do it, can do it.

How come you said "Not the review"? I'm curious.

There's the Review that tells you if you had brilliant moves, your percentage, etc. That one is the one you're only allowed once a day if you're not a payer. That one is missing the clear arrow that shows you the best move.

But the full analysis, which is free for all, tells you the advantage and the best next move. I find that more valuable for learning purposes.

Nothing to do with math. At most, just a modicum of logic, in its elementary "if-then-else if" construct ; but so elementary that you don't have to be Aristotle or Gödel to excel.

The skills involved in the game of chess are: visualization, memorization and recognition ( of chess patterns ), and a great ability to stay focused on a single repetitive mental exercise, always the same, which is repeated with each move, without being distracted for a second.

These are skills that can be developed with constant practice. Some can do it more naturally, others need more effort. As for the drawing. There are children who, without having done any practice, immediately show that they can draw well, much better than others who do not even know how to hold a pencil in their hands, only producing scribbles. In any case, everyone is able to learn how to draw, with the right method and the necessary commitment ; and even the "talented" necessarily have to work hard to become artists.