I suck at
Mathematics, i have dyscalculia, google it.
Remembering anything, i can't remember a list of instructions more than two things long. I forget the day of the week, important dates, where i left my keys/wallet/phone. You name it i forget it. Strangely enough, i never forget peoples names.
Concentration, probably the reason for the bad memory if i'm honest, it's a miracle i managed to make it through school and 2 years of college. It's not that i procrastinate or anything, i just start to day-dream without realising.
Sticking with something until the bitter end, i could list the things i've given up on, and i will. Guitar, keyboard, hockey, trampolining, Dead Rising 2, a couple of jobs... Maybe more but i can't remember (see above

)
Handwriting, sometimes i can't even read it myself, i have to write everything in caps to make it legible.
That'll do i suppose, but no doubt there's more that i've missed.
That was kinda therapeutic you know ^^