If you've known him for over a year, I don't think the way you feel is too "out there".
I knew Shinzuu (my boyfriend) for a little over two years before we started dating, and I had very strong feelings for most of those two years. (Apparently, he didn't think my feelings toward him were serious and that's why we didn't date sooner, but that's beside the point.) It wasn't very long into our relationship before I decided I wanted to spend the rest of my life with him.
Also, I'm naturally kind of clingy in a way. I like to be with him as much as I can, even though I know we need to have our "me times". And I worry about losing him all the time even though he always promises he will never leave me.
So it's understandable for you to feel that way, in my opinion.
I lucked out. Shinzuu had strong feelings for me from the beginning of our relationship too, so we were only a couple months or so into our relationship when he asked me to marry him (not an official, "got down on one knee" proposal, but it was a sincere one) and we've been together for almost four years now (and still planning to get married once we get things sorted out).
Maybe you'll be that fortunate too. Tell him how you feel. Don't be like, "I WANT TO MARRY YOU NOW!" but just say something to the effect of "I hope our relationship lasts a long time." Test the waters with hints of your stronger feelings to see how he reacts. As the other two have said, take things slow or at least at a moderate pace. Don't jump right into the wedding planning.
I know it's scary to express one's feelings when you're worried about someone not feeling as strongly as you, believe me. I really hope things work out for you though.