I don't think I mix pronouns, but I have a tendency to jumble grammar, use incomprehensible substitutes of words or expressions because I'm unable to find the right one without pausing and thinking, and even doing so, results are less then pleasing...
I'm fortunate I don't have to bother with gender-specific pronouns in everyday life, since they are totally absent in my native language. ![Razz :P](./images/smilies/icon_razz.gif)
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Another non-English speaking - DX'd at age 38
"Aut viam inveniam aut faciam." (Hannibal) - Latin for "I'll either find a way or make one."