do i have a sister???

Actually, i was supposed to be born on 25 of January, 1992. but it's only on 29 of January, then i was born...
then recently, i felt that ever since i was born, my feelings towards boys, situations, teachers, frenz... were actually good and all...
But then, if i was born on 25th instead of 29th, will my feelings and character be the same?
So... did i steal my actual sister's place???
i dunno how to explain clearly...
cos' my mum and dad often told me that i'm silly, this led me to wonder if i was born on the 25th, would i be clever and everything sweet???
also, i'm born in the year of goat, and they said that, of all animals, goats (sheep, lamp, whatever) are the most silly. that's why sometimes you see, if one made a sound, the rest will follow...
Well, not neccesarily...
in conclusion, the qn is... did i steal my sister's place? the answer is unknown... pity really...