Am I ready for the sex?

Rachel
Hey guys ☺️ So I've been dating this amazing guy for almost 5 months, and we both knew we liked each other for like 3 months before that so could have been dating longer. 
Anyways, the two of us were really only in a emotional relationship, like it took him a long time to kiss me (both of us were our first kisses! 💏) and we just didn't jump on the "sexual things" wagon until quite recently, about a month or two.
We both have been telling each other that were in love and all the jazz, and we're both feeling that like strong connection between us. Yeah, I know we're both 17, but sometimes I wish that I met him later in life because then I would want to marry him. And he's like that sweet kid in school, the one that everyone knows that he would never ever break a heart and he also said to be he wanted to wait until he knew he was in love with a girl before he even started dating her.
So basically, he's been in love with me ever since we started dating, which is kind of cute. I've talked to him about sex before, it said it scared him but it wasn't enough to scare him out of ever having sex. And I guess that's how I feel too.
So judging by what I've told you all, can you tell me what I should do about sex? (Like this might be TMI, but I look down /there/ sometimes and I think, how is a penis even going to fit in that tiny hole? Haha 😂)