I have never met a fat person who wasn't aware they are fat. I do know two people who have failed to lose significant weight even after bariatric surgery physically restricted how much they could eat.
After even the most extreme medical intervention fails and you are still obese, what can you do? Stay inside your home forever so that thin people are not forced to look at you? Never eat a piece of cake in public? Never go shopping, never date, never dance?
Of course not. In the end the only choice is to live your life anyway, in spite of your reduced opportunities and the judgment you receive from others.
If you're brave, you might even dare to post photos of yourself on Instagram.