I would shoot it. It may not even be a male. It appears it would qualify as a non antlered deer by Oklahoma law. It is more than likely has a problem with testosterone/estrogen.
I'd let him go at least another year to see what he becomes, google "cactus buck" and see what he might be in a year or two.
Even if he isn't sterile, he still most likely won't breed this year because he is so young.
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