A bit scared

This might sound goofy, but a girl needs help. I’m 17 and I have had this amazing guy for a while now. We were in his truck one night, making out, and it started to progress. He put his hand down my pants and started to stick his fingers in my pussy. I pulled his hand away and we continued to make out. But I’m trying to figure out how to get over my fear of it. I am so scared. I don’t even wear tampons so nothing has ever been stuck up there. I just need advice on how to let loose and be more comfortable and not anxious next time.