Serect bc pill

So I’m 14 and I really wanna be safe having sex with my boyfreind but we never have used a condom and i reallolllllly wanna get the birth control pipl but I can’t let my parents know because they won’t let me. But I still wanna be safe. How could I go about getting the pill without them knowing I got it ((I have brothers and sisters older than 18-21 that could take me keep in mind))