Why do i feel the urge to put pressure on my vagina with my hands until i feel tingling and it hurts? i do it sometimes. is it dangerous?

If the action hurts you, it is probably dangerous if repeated often. The action you describe is not a masturbating act because you do not enjoy the act and that behavior seems consistent with a compulsive behavior. Instead of pressing your vagina, you put your hands in very cold water and it could ease the urge. You should see a psychologist if this behavior disturbs your daily life.