Stranger, you're just fine, I promise.

lol EVERYONE has something on their body they wish they could "fix," I would wager. Often, the thing we want to "fix" isn't even remotely close to broken though.
You've nothing to worry about. I can nearly guarantee you, your boyfriend probably doesn't care in the slightest that your labia are slightly asymmetrical.

If anything, he's probably more upset that you're upset about it.