Help! He's so much older than me!

He's 37 and I'm 18. We started having sex few days ago. Shit is crazy and so intense!! Last night I sneaked out of my house at 11PM while my parents were asleep so we could find a spot to have sex. We found a quiet dark spot and I bent over behind his truck. It was so much fun! Later on he dropped me off and my parents were still asleep. My heart was literally pounding. He's so hot! He doesn't even look like he's 37, and I love all his tattoos. What I need help for is, our age gap is so big sometimes I don't know how to act with him. We met at the place I work, he's a costumer. We text each other quite a bit & more at night, he takes hours to reply my texts during the day because he works. The sex is pretty good and rough the way I like, but he's already talking about doing other stuff to me like different positions, anal, facial, etc. I love all that, anal is my favorite and I told him. But I'm afraid he'll get bored of me after we do all of this? Should I go slower than this? Or should I just be myself and do the stuff I like in bed with him? Thanks in advance.