Not true!
Every person who is of at least average intelligence can complete mathematics courses successfully through the entirety of calculus.
You simply haven't figured out how to teach yourself mathematics efficiently yet. If you really dove in and gave it your full effort, you could master an astounding volume of conceptual material-- you would surprise yourself.
Math just can't be half-assed, though. It's an all-or-nothing kind of thing, you have to devote at least a few hours to it every single day or you'll never progress at an acceptable rate.
No offense, but not knowing statistics and geometry is like not knowing how to use a computer.
I wonder why so many people consider mathematics to be such an ancillary and specialized segment of academia-- it forms the basis for the entirety of logical thought-- I think it should comprise a sizable portion of education relative to
any field of study.