Do you think math is something that we decide/invent?

Many of the things that might look esoteric or hard to understand often do have some non-abstract meaning/application. “Imaginary” numbers are a good example - they have applications in electrical engineering and can be understood to represent phases/rotation. (Although those weirdos use a “j” instead of an “i”)

Unless you’re doing extremely high level math - like doctoral level - I can guarantee you there is some application.