The real reason that you find it necessary to compare yourself to others is that you’ve fallen under the spell that says that good things are always scarce. The scarcity model says that if the person that you’re comparing yourself to is (arguably) prettier than you, then that person has grabbed up too much of that thing called pretty and now there’s less for you. Same thing goes for fame or money or talent or intellect — the belief that those things are scarce makes us compare ourselves to others in terms of how much of those things we have versus what they have. When we lose this comparison battle we feel bad, jealous, envious, and less than whole. When we win the comparison battle we feel a bit of satisfaction mixed with an underlying fear that we may have won this battle, but what if things change and we lose out next time?
The key is to reconnect with your sense of abundance. For example, if you feel like everyone is more beautiful than you, start to look for beauty everywhere, particularly in people whom you might not normally think of as beautiful. You may find it easier to then see that beauty in yourself.