Oooooo this stuff is so exciting! This is exactly how me and my boyfriend got together- we'd been friends for a year, and I'd liked him that whole time. Then he started treating me differently, and I started picking up interesting signals. My friends basically said "You have to talk to him, because this is not normal friends-y stuff." Like you, I was pretty darn sure there was something there. It took a while to psyche myself into it, but finally, my heart pounding, I left a choir rehearsal early, barged into the office where he was working on some tech support stuff, and said "We need to have coffee, now."
We went to an ice cream place and sat down and I was freaking out! I actually said to him "Is there any way you could make this easier for me, and assume we both know why we're here?" And he knew. We talked it out, and at first it didn't even go that well, and he said yes, there was something, but he wasn't in a place to be dating. Then we kept talking and he changed his mind.
Talking is the best option. By the sounds of things, it's going to be a very smooth conversation for you guys!! I hope it works out as well for you as it did for me.
If the talk doesn't go as planned, after speaking to a few guys about it, the general opinion is that there's an awkward period, but more often than not they're genuinely interested in looking past the girl's feelings and continuing the friendship. But by the sounds of things, this shouldn't be an issue!!
Good luck. I'm excited for you