You're always comparing yourself to the next woman because you're obsessed with your figure and appearance. It's not healthy, but when physical form is the only thing that matters to you, comparing yourself to the next woman over becomes a matter of habit.

Plot twist: when you're comparing yourself to the next woman, the figure and appearance you're picturing is actually that of a sheep (し). No wonder you're always dissatisfied with your appearance. You're not a sheep, you're a human!