Remember that no one is perfect, and the people you see that live SUCH “perfect” lives are Faking it.. such as “The Kardashians” , or models , and so forth. Someone once told me every morning, look in the mirror and say : You are beautiful. Repeat it a few times. And believe it’s true. Do that every day. It may sound goofy but it works.
I struggle with the same thing as you! My therapist told me to put sticky notes on my mirror with POSITIVE self affirmations! Reading them everyday works! Also keep a daily journal. Being able to let out all your brain clutter helps with the burden of not feeling good about yourself.