When I'm on my period I don't get any direct period pains, but for the first few days, it really hurts in the opening itself, where my blood comes out. Is there something wrong with me?

Period pains often ‘radiate’ downwards towards the thighs or out into the back. Your entire lower abdomen is affected by your hormones and nervous system. Your body is particularly sensitive during puberty, when it’s developing quickly and in lots of different ways. There’s nothing wrong with you.