Way tmi but need advice 😂

I’m 19 and iv never had sex. I am 1 month into a committed relationship and on birth control and ready to have sex. But since I never really needed to I barely kept up on shaving you know what. I did a little but only until I was comfortable bc it kind of bothers be having hair down there anyways my question is how do you shave in the areas iv shown with out cutting yourself? I have a lot of butt hair which is right by the hole it goes in and I’m trying to shave it but I cut myself and then it burns. Please no judging but help this unexperienced girl out 😂🤦🏽‍♀️