I'll try to explain more.
You are not "dumb" or anything like that. Its what they want you to feel. Mathematics and science like everything else, and actually aren't different from arts at all. The former takes the scientific variable objectively while the latter takes it subjectively.
The point is, you are already applying math, science and arts and everything else in your mind. But not in straightforward way. The notion of intelligence is overrated and misleading and actually gatekeep people from reaching what they want.
A functional brain is enough to perform all of those tasks. And by practice and development, your skill levels will increase. Its not being "dumb" or "stupid".
You just need to work on a specific topic and you will improve. So what you experience in not "stupidity", its just that you don't deal and improve your level at the topic and thats it. To be better in math for example, you need more time and work for it.
Education and academics also are very bad. They don't want you to be knowledgeable, they want you to be ignorant. Are they really teaching mathematics properly? No. And of course, its not only mathematics but many other topics. However, in case of mathematics its on the extreme side (the other equally bad thing is music). In mathematics, they don't teach you anything but to solve repetitive problems but they don't teach the core of the topic and how things are really are.
Thats because they don't want you to think and instead they want to put restrictions. True thinking is something that threatens humans propagandas (like prolife and natalism) and thats the reason for making knowledge inaccessible and limited inside academic ivory towers and repressing the minds of people (its great we have technology and internet nowadays so they can't gatekeep people anymore).
So are you "not intelligent"? No. Its not like that. Actually, your mental capabilities are repressed by gatekeeping, oppression, hiding information, social pressure, false indoctrination and many more. And I'll state the reason explicitly. Repressing minds is something the species do to make people reproduce and justify suffering and problems.
You only need to use what you have. Your brain is already a scientist and an artist. You hear the sound and analyze it subconsciously. You see the images and understand how they appear. Your brain is already using mathematics, computation and logic all the time and if you are an artist, gamer or anything else, you are already using it a lot.
Don't believe that shit of "stupidity" because the potential is actually huge and repressed by others (specially gatekeeping). You can understand math, science, arts, learn languages and do more if you want.