Any advice? Every time I shave down below ( my vagina) I get painful razor bumps on the sides of my…

Any advice? Every time I shave down below ( my vagina) I get painful razor bumps on the sides of my crotch like where my panties go and a little on top. It doesn't matter if I use a brand new fresh razor or not. I lather up with soap or shaving creme before shaving so its not dry but still get painful bumps! It doesnt happen when i shave my arms and legs just down there around my butt and vagina area.