Not only is it not too late, but in some ways it is *better* than learning as a kid. As an adult you have motivation, determination, a bigger vocabulary to understand explanations ... and a more mature sense of what's cool and interesting.

I recommend finding a used copy of one of Martin Gardner's mathematical recreation books -- it might awaken a sense of fun in math that was probably missing when your were sitting in math class in high school.

There are lots of good math channels on YouTube. Check out Mathologer, Numberphile, 3Blue1Brown, Stand-up Maths, and RedPenBlackPen.