are you talking about the barre or just the plain F cord..if it is the plain F cord you can try to put the palm of your hand more towards the front..I have notice that when I play any other cords the palm is more behind the neck but with the F cord my palm is more in front with my thumb more in the middle of the neck ..Don't give up it is a bit tricky doing the F cord and with time you will get it..we all do :) don't give up and good luck