11:21a To my shame I concede that we were too weak for that!

I am ashamed to admit that we were too timid to do those things! (Good News Translation)
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We (excl.) have been too fainthearted to do those things ⌊to you⌋ ! I would be ashamed to do them!
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We have been too meek/gentle to do those things ⌊to you⌋ ! I am certainly not ashamed that we avoided doing them!

11:21b Speaking as a fool, however, I can match what anyone else dares to boast about.

But, talking like a fool, I say I can bravely boast about any subject that someone else might bravely boast about.
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But regarding any topic that someone is bold enough to boast about, I also am bold enough to boast about. (Just remember, I am talking like a foolish person does.)

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