I'm lopsided, too, in just about everything.

I think it's normal to be non-symmetrical. Probably has to do with leg dominance and with injuries (e.g., still favoring something because it used to be hurt) or with just plain ole genetics.
Just keep working them evenly. On the single-leg exercises, do your non-dominant leg first so you make sure you're getting as much work out of it as possible. In exercises with both legs, make sure you're pushing evenly and not letting one do most of the work.
And I don't think anyone else is going to come along and measure your legs. So no worries about them. :P