Is it normal for a 13 year old to get these? I got them all the time and they are in little groups, the biggest I've got one is the size of a pea. They are really hard and white, when I squeeze them they puss white stuff then blood. Sometimes when I walk they pop and they sting. When I walk they rub and it hurts a lot. I've never had sex though. Do you know what these might be? I'm a bit worried!