there is a curse on me that wont let me finish any final fantasy game (in 1 try)

i have unwillingly abandoned FF7, im at a difficult part and its been a view months.
FFXIII, the first time i made it till the final boss, wich i wasnt able to defeat.
Crisis Core, managed it on a 2nd playthrough though.
FFX i can finally play X again and now i am stuck. but i am NOT giving up!
XIII-2 .. got a couple of hours in it and got stuck :l i have not played it every since
i was going to play XIII-2 when i have beaten XIII, but im stuck there :l and an half hour bossfight that will end up in defeat is not very apealing

ooh and lets bot forget VIII, its more about the game style (with the aeons) and the general look or feeling i get from it. i just cant get myself to contineu playing it