If I Continue This Way, Will My Gf Dump Me?

ok so i’ve been in love with this girl for 2 years. last week, i asked her to be my girlfriend and she agreed so now we’re in a relationship. but i don’t know how to act or what to say when i’m with her, i’m kinda nerdy so i don’t have that much of a social skill. i talk about chemistry and algebra but she doesn’t seem to like it…i know that there’s this guy that also likes her, hes good looking and popular ( he hates me). i don’t want to lose her to that jock guy, what should i do, what if she dump me cause i’m boring???? she’s a cheerleader and her friends don’t seem to like me. is it because i’m a nerd?? she’s my first girlfriend !