Let me give you a little insight on this. First off, I hate that this happened to you and your new plane. I have done this before and it will drive you nuts just thinking about it. Do not worry about it. The plane will more than likely fly perfectly, I'm 99.9% sure of it. Just to let you know how far off a surface can be and the plane still fly pretty good, I fly a lot of combat. If you've never seen a SPAD, when and if you ever do, you'll swear that it won't fly. These planes are thrown together in a matter of hours using anything from gutter pipe to election signs. During combat, these planes take some pretty hard hits, nearly knocking the wing or a tail surface completely off. A lot of times the plane will still fly, and sometimes it ends up taking a dirt nap. After inspecting some planes that have successfuly flown after taking a major hit, some have half the wing missing, or the wing knocked unblievably crooked. Some tail surfaces may be missing or barely hanging on.

What I'm trying to say is, a plane can be far from totally even and still fly nearly perfectly. I know, I know, you're not talking about a platic airplane, you're talking about a balsa plane that is fragile. It doesn't matter as long as it's not a biplane, that can be a whole different can of worms.
Don't worry about the minor mistake, the plane will fly just fine!