I pierced my belly button a few days ago, and it has puss in it and I'm not sure if its infected or not, and my parents don't know I pierced it. I can't let them know about it and I can't let it get infected. Can anyone help me please?

If it is white puss then that's generally normal as its to do with your white blood cells and the healing process. Any other colour like yellow or green and you probably have an infection and need antibiotics from the doctors.