“如果你已经做出选择，那就不要后悔”这句话地道的英语怎么翻译？

这是个虚拟语气,简练地道的说就是:If you got the choice, never regret

Don't be regretful once you have made up your mind.

Don't be regretful once you determined to do something.

Never regret whatever decision you made.
Once you make up your mind, insist on/stick to it/hold up.
<自己造的,地不地道就不知道了>

If you have made a decision/choice, you should not regret.

you should not regret if you have decided

don't regret if you have already made the decision~