In love at 15

So when I was 13 I met this amazing guy and we started dating. I am now 15 and he is 17 and it's been 2 years together. He's been working for a year now and I'm still in school. I've thought about it and he's amazing I love him with all my heart and we've been through hell together. He says he wants to have a life with me and that I'm the best thing that's happened to him and I want that more than anything when the time is right.

I'm just wondering since we're each others firsts, are we making a mistake? We both havent done or tried much so to be in a relationship from this young and to stay in one sounds a bit scary but then everything I want. Will we grow up missing out tho? You know, on that single life. I feel like I'm settling down a bit early even tho everything feels right ATM. I'm just concerned we'll both feel like we missed out on things when we're older...any advice or thoughts?

I know I love him I don't even need to question it, And there's no way I can lose him. I'm just a bit scared.