Why some girls are merciless?Also how can I face them again?

I am a 17 year old boy belonging to south india.A woman's volleyball tournament is undergoing in our town.One college team is staying in my home.Yesterday evening I followed the team to my home after their match in which they were defeated while all others in my family were watching game.All are at age of early 20s and they were looking so nice wearing their shorts.I started to teasing them for their loss.They were allready dissappointed and they were getting irritated.When we reached home their captain asked whether I can block their smash.I accepted it and she smashed the ball in a lightening speed.Ball hit me squerly at my groin.I was shocked out of pain.All girls were laughing at me and they mock me by keeping their hands on their groin.I cried there infront of them.Yesterday I couldnt sleep because of pain.Now I didnt have dare to see them again.They will be in our home for a week atleast.Why some girls are merciless?Also how can I face them again?