Is he too old??

So I was at a coffee shop with a group of friends (guys and girls), when this guy walked up to our table, sat down next to me and introduced himself. He listened to our conversations for a little bit and when he learned we were talking about trucks, he piped in and started laughing and joking with us. He seemed to.be focusing all of his attention on me though and I enjoyed it. Eventually he asked for my number in front of everyone and all my friends were like "Damnnnnn get it girl". now I didn't have a phone at the time and so i told him that and he replied "So how am I supposed to take you to dinner then?" which I found really cute and all. Then I gave him my snap username and he made me pinky promise to message him when I get a phone. I now have a phone and have been talking to him and we've been on quite a few dates. I am hella falling for him. But he's 19. I'm 16. when I met him I thought he was still in highschool and he thought I was at lease a senior because I look and act way older than I should due to the way I grew up. Someone help.... what do i do?