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Doesn't it matter that my stack is fine and I'm probably only a 55-45 favorite?

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Seems unlikey that you're that big a favorite. You're a 60-40 dog to a set, 57-43 to a KJ straight, and I think they're probably more likely to play it this way than top pair, to which you are a 55-45 favorite.

Overall, I think you're a likely dog to the range of hands you should expect to see, though there may be enough in the middle to make it a correct call on pot odds. I doubt that taking what is unlikely to be much better than a flip this early is +$EV, though.