It is presumptuous of me to wish to choose my path, because I cannot tell which path is best for me. I must leave it to the Lord, who knows me, to lead me by the that which is best for me, so that in all things His will may be done.
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Gender-neutral version:

It is presumptuous of me to wish to choose my path, because I cannot tell which path is best for me. I must leave it to the Lord, who knows me, to lead me by the that which is best for me, so that in all things the Lord’s will may be done.