Lewy why no have another crack at the maths?
What was the problem crap teacher? Or are you really just hopeless with numbers?
Are you practical e.g. do you spend you weekends tinkering with car engines etc? You said you studied engineering for a while... where and what for?
Bit hard to say if you will cut it as an aircraft engineer based on what you have posted so far.
However if you just have no clue with numbers etc the engineering may not be the way forward.