In your Dad's defense, he is right in a manner of speaking. If you just drop your arms down to the animal and not bend at the waist, you will shoot high. This is because your line sight changes. If you bend at the waist, this keeps your arms in correct form and your line of sight stays the same. Try it once and it will prove that I am right. Try shooting with just dropping arms and then bending at the waist. It will show you by where the arrows hits.

Unless your sights are off?

Just because I know this, doesn't mean that I never missed a deer real close. I actually hate shots under 10 yards. I'll take them though.

Good luck, don't let it get to you. Everyone has missed once or twice. If they say they haven't their lying to you.