advice

okay so my boyfriend and i are both virgins..and we're about to have sex for the first time..but im super scared and he's super ready .. im overthinking things like the scare of getting pregnant while im going into my last year of high school and sneaking around my parents to do this .. any advice on how to have safe sex??? cause im so scared ... like super duper fucking scared ... idk if im overthinking it but i don't wanna be the next teen mom...help PLEASE