NET
21 Were you called as a slave? Do not worry about it. But if indeed you are able to be free, make the most of the opportunity.
Darby
21 Hast thou been called [being] a bondman, let it not concern thee; but and if thou canst become free, use [it] rather.
KJV
21 Art thou called [being] a servant? care not for it: but if thou mayest be made free, use [it] rather.