Pick something "easy" (high school trigonometry did the trick for me) and try to understand it completely. Don't look at hte formulas or the proofs, just look at the problem space itself.

You have a circle with radius=1 centered in (0,0). Draw a line from the center of the circle to any point in the circle. Now you build a triangle using this line as your hypotenuse. Inmediately, you will see that the heigth and the width of the triangle will be in (-1, 1). That is why -1 <= sen(x) <= 1 and -1 <= cos(x) <= 1. You can see that your triangle is always a rigth triangle so you can apply Pitagoras. That is why sen^2(x) + cos^2(x) = 1. Keep thinking about it for a few weeks and you will realize that all the formulas you memorized in high school are just common sense, you can deduce all of them just by drawing a circle with a triangle in your mind.

Try to do the same with other stuff (set theory is a good second thing to look at). You will discover that math notation is just notation and that many proofs (at high school level) are just common sense written in a very formal language.

Think about what the maths are about, not about formulas or notation.