Why did no one say happy birthday to me?

Well today is my birthday :P and no one wished me happy birthday. I had to remind my mom :/. I mean, I go to all my friends parties and I remember all their birthdays and give them gifts but I get nothing. Not a card, gift or anything. So only 1 of my friends decided to get me a last minute gift. D: Whenever I try to be nice to the world, they world isn't nice to me back.