Pubic hair

Okay I am 15 years old and I have a boyfriend. He's been my boyfriend for two years. He's gonna see down there from time to time. (Please no hate -.-). I have noticed lately that most girls my age are completely bare down there. I want to be the same, and I shave whenever my boyfriend comes to see me. However, since he stays the weekend it usually grows back prickly within a day.... And I need it to be gone for atleast 3 days. I cannot wax it, I'm only 15, but I do shave. I have also noticed razor burn. How do I remove my pubic hair without razor burn? Please keep in Mind I'm only 15 and do not have access to most things. Thanks :)