1st Time Having Sex....

I’m currently a virgin. I’m 16 & my bf is 18 and we r both ready to have sex. I’ve never done it before, he has. I’m not on birth control but plan to use a condom and he’ll pull out before he cums. I’m a little nervous for it cause his dick is big and I’m hoping it won’t be painful and I’m also worried the condom could break. Can anyone give me some advice for my first time?