Andrew- it is a dragon you must slay. Whilst the maths needed for flying aren't greatly above what anybody should need in life, calculations, and even mental calculations are a fact of flying. Working out time for a given distance and groundspeed, effects of wind on aeroplanes moving at particular speeds, adding up fuel, converting kilos/pounds- all these things need a measure of ability. You still have time- take private lessons, burn the midnight oil- you don't have to accept it as some disability. You can 'get rid of the problem'. And all these things will be useful to you in life anyway. Don't try and sidestep it! Practice practice practice!