Also, since your not getting proper sex-ed in school, we should probably clear up as much sex myths for you as possible. Everyone else feel free to contribute anything they can think of.
-It's possible to get pregnant on your first time.
-Birth Control is mostly perfect for women, unless they fuck it up. Condoms break every once in a blue moon though, so doubling up on protection helps. Use real condoms, use ones that fit your size, and don't reuse them.
-While extremely, extremely rare, it is possible to impregnant a girl by cumming on her inner thigh if your swimmers are strong and he uterus is weak on the defenses. So be careful with your shots with all those handjobs/dry humping stuff that I know younger kids do that our ancestors used to call 'second base'
-Don't trust any ancient myths like girls can't get preggo during a specific time period like their period, or right before or after their period, or when there's a blue moon and the Redskins win the Super Bowl or something. Most of these are 100% false, and even the ones with some truth in them are DEFINITELY not solid. And I don't even mean there's still a .001% chance of getting pregnant during, say, her period, more like 30-50% chance. Never ever risk it.
-Special positions or diets or something doesn't help prevent pregnancy. This is so fucking stupid why do people even believe this....
-Also something insanely obvious: you can get pregnant on your wedding night. I know someone from college who was super religious, and responded to "deviancy" (aka not good christian behavior) by ignoring it or running away. He created his own bubble of ignorance. He just got married less then a year ago and recently had his first child. According to a mutual friend who just visited me, he and his wife are apparently really upset because THEY DIDN'T KNOW YOU COULD GET PREGNANT ON YOUR WEDDING NIGHT. Like, some sort of God-force-field prevented conception. Jesus titty-fucking christ I don't know how he even enter college, let alone graduated.
I'm not going to bother with myths about the act of sex itself like "everyone is doing it!" or advice for finding someone like be a confident person with a touch of asshole, because I'm sure you've heard the former plenty in your abstinence only education, and the latter is life experience that comes with time. If anyone else has something I missed or personal horror stories feel free to share.