Lucky number

My favourite number is 9, I don't have a reason but i always choose this number and it gives me a good result! I believe that this is a good number to select in games or something like that. (9 is a good mark in test too, but unfortunately it's not common in my life!) Some people say that this number doesn't bring luck, but I believe in the number 13 as 9, so I prefer to thing that all the numbers change their sign acording to the person who believes on them..