No, they can't kill a teenage mother first timer.
They are just abnormal cells that are found when a pap smear is done. When I had my last pap smear I had mild dysplasia, and it's nothing really to worry about unless it gets really bad, and your doctor will perform surgery to remove the cells. And yes, you can get pregnant with them, b/c I have/had dysplasia and i'm pregnant.
Good luck!