I struggled a lot with esteem issues in the past and while it's relatively easy to say don't invest your value into your looks it's not so easy to do. I realised one day that my feelings of attractiveness were tied to my other achievements - I always felt more physically attractive if I was doing well in school, career, personal life etc. if I did something I was proud of I felt like the most irresistible beautiful woman on earth! Long story short, what I'm trying to say is maybe try working on confidence in your other abilities, talents and achievements and your sense of self esteem in the looks department will follow suit. Maybe, hopefully