That’s so cute! No, you’re fine. Totally 100% fine. It’s just one grade apart – which, admittedly, is a bigger gap maturity wise than say 22 and 23 (which is nothing), but it’s still just one grade difference. Right now, it seems a little bigger than it really is because of all the big events that start happening at 18 (legal, graduating, going to college, etc.). 2 years from now, your so called “age difference” will be nonexistent. It’s just a weird little period of your life where you’re still a teenager, but the magical number 18 makes the world think of you differently, when you really haven’t changed at all. Don’t worry about it.
However, the thing that you might want to start thinking about is what the changes in your life are going to do to your relationship and whether or not you’re going to be able to evolve with those changes. You’ll be graduating, likely going to college, and she’ll still have another year of HS. In a sense, you’ll be leaving her behind. There’s absolutely nothing wrong with your ages, but you two will face a big life event here and it is ALWAYS taxing on a relationship when one starts to move on to something different before the other does. I wish you all the best!!
Sumptuous Daydreams 