If your desire is to play folk music do it by ear and hold the bow as it is most natural to you.
If you want to play classical or in an orchestra then there are very stricct rules, but if not toss the rules aside.
Nothing can strip the "life" out of a good fiddle tune as quick as an attempt to play it by note. ( I.E. directly from the music sheet) The timing and feeling of the performer are an integral part of folk music and this will be lost.
Notes are great for learning a tune but after that a good fiddler will burn the sheets and play the tune from memory. If your teacher objects perhaps you have the wrong teacher.
The above is only my subjective opinion!
               Sandy