You are looking at outward appearances. If anyone is confident that he belongs to Christ, he should remind himself that we belong to Christ just as much as he does.
KJV
Do ye look on things after the outward appearance? If any man trust to himself that he is Christ’s, let him of himself think this again, that, as he [is] Christ’s, even so [are] we Christ’s.
ASV
Ye look at the things that are before your face. If any man trusteth in himself that he is Christ’s, let him consider this again with himself, that, even as he is Christ’s, so also are we.
For even if I boast somewhat excessively about the authority the Lord gave us for building you up rather than tearing you down, I will not be ashamed.
KJV
For though I should boast somewhat more of our authority, which the Lord hath given us for edification, and not for your destruction, I should not be ashamed:
ASV
For though I should glory somewhat abundantly concerning our authority (which the Lord gave for building you up, and not for casting you down), I shall not be put to shame: