I want birth control but mom won't let me get it

Okay some of you may be thinking if you need to ask your mom you are too young, well I am having sex while I am using condoms I get very nervous. I want to take the next step so I can be safe for both my partner and I. I have asked my mom and she has freaked out on me and inevitably told me no. Any tips to try and talk or reason with my mom or any suggestions on how to be safe.