Gooch,
Think about it this way. Just because you are a guy would give a great blowjob? No, its about practice and technique. If you have never given a blow job or eaten pussy your technique is not going to be very good.
The problem with your friends comment is that she is making a whole to part comparison. She had oral sex with a girl with great technique and so her conclusion is all girls must have great technique. Nope, that's an inductive fallacy.
Learn all you can and they will talking about the greatest oral I ever had was with Gooch.