There’s nothing like comparing yourself to someone else to completely illuminate your insecurities. Whether you’re knocking their choice of boots or feeling particularly envious of them — most of us admit to the up-down glance [1] — by sizing them up against yourself, you’re only serving to further your own worries and self-doubt. So check out my tips on how to free yourself from this possibly detrimental habit and .

• Ditch the competitive streak for a while. Although the desire to be better than someone else can be extremely motivating, it can also put you in the position of feeling unsatisfied with yourself no matter what you achieve. In a world filled with 6 billion people, you'll always be able to find someone "better" than you so try to keep things relative.
• Instead of focusing on everyone else, turn all that attention to yourself. Consider your own accomplishments [2] and pat yourself on the back. Running for 20 minutes might mean nothing to the girl on the treadmill next to you, but that doesn't mean that it's not impressive in your book.
• Jealousy is a lot easier than change. Turn your envy into emulation. While it might be second nature to compare yourself to someone else, learn from them instead.

It's so much easier to stay positive when you don't feel that irrational need to measure yourself against someone else, so do your best to fight the urge!

Source [3]