I struggled with Algebra II and Trig. I got through the classes mainly through the assistance of my next door neighbor, who was a mathematician. My problems weren't with the formulae, they were with dealing with the abstract. Chemistry and Physics I did very well with, as you had concrete results as opposed to a mishmash of X's and Y's.

I have to disagree with the statement about females being worse at math than males, as the best person in dealing with pure math is our older sister. There are also female mathematicians scattered through history,most notably Ada Lovelace and Madame Curie (You can't separate the physics from the math) I personally think it has more to do with nurture and societal expectations than ability.