I have never felt my babies before 20 weeks. This is my second pregnancy and I think people who say they feel their baby that early are either feeling gas or really sensitive to the baby's movement. Either way, it worried me too. But you will feel baby eventually. Just relax and enjoy the ride!
I was the same way. It seemed like everyone I knew had felt there baby move early on and I hadn't felt anything, but I finally felt a few little kicks one night when I was between 17/18 weeks. It'll happen, just give it a little time and congrats!
Everyone and every pregnancy is different. You will when you least expect congrats and good luck