Sexual fantasy

I don't know if this is normal or not.
Every since i was 5 years old, i started to like to get spanked on my bare butt by a woman.
i had that alot as a kid and when i moved into foster care, i wanted my foster mom and older foster sisters to do that to me.
i was afraid of the pain but i also felt horny about it.
I would try to provoke them into doing it and when i got it, i got a hard on but then my foster mom did it real hard and continuously and i didn't like that at all.
i then felt embarressment.
is this normal for some kids?