I might do "The Chop"?

Here is what you can do to figure this out. Take a section of your hair that is parted at each ear, about 1/3 to 1/2 of your hair. Now take a large Tooth Comb, usually females have these lol. Grab your hair like a front ponytail and take the comb and face the teeth forward away from your face. Put the comb through your hair starting at your eyebrows, as the comb drops down your hair will get thinner as it goes down the comb. Usually about three or four inches from the end is where it starts thinning. At that point grab your hair and measure it to your shoulders. Do the same with the back portion. If you are good at this you can take a ponytail of all your hair above your head and move the comb upward and your will see hair drop out, usually what is left in the air is the thin portion. If you have a hard time doing this ask a hairdresser to help you (use to be one of those) Good Luck