Sex and scared

Okay I’m scared of having sex because I’m scared that I’m going to be used, left with no warning, and I’m scared of getting pregnant. Yeah I know “if you’re safe you shouldn’t have anything to worry about” but every woman in my life has gotten pregnant young. My grandma got pregnant when she was 19 and my mom got pregnant as a sophomore in high school, my sister she was 17. I’m 16 and I feel like one day I want to take that step but I’m scared that something going wrong like my birth control stops working or the condoms break. I’m not ready to be a mother hell im not even ready to grow up. What should I do?