Start with little things. I have self confidence issues because I'm ****** at everything, but I am perfectly content with my body. Sure it's overweight, overly hairy, and I have the face of a constipated walrus hit with a shovel, but I genuinely like the body I have. Why? Because it functions perfectly fine. My arms lift, my legs move me, my heart pumps at standard human capacity, my nerves are accurate, my eyes do not require corrective lenses and have shown no signs of degradation despite both sides of my family having notoriously poor eyesight, and my organs all work as they are designed to. I may be ugly and unfit, but I'm perfectly healthy (apart from my brain) and I like having no pills, no disabilities or requisite surgeries. That's where I start, small things.