Second, most people tend to value themselves in comparison to others. Who are some people you look up to, and why? Is it a fair metric? Maybe you wish you had those same qualities, but are they really the qualities that a person's worth should be defined by?
Third, as a kind of stop-gap measure, evaluate your physical health. Do you go outside often (ideally near trees/greenery), get enough sun? Are you physically fit? How's your diet? Are you getting enough sleep? These things cumulatively affect your mood and state of mind.
Fourth, investigate whether there are any parts of your life you would like to improve, and if so, make a basic plan and start it. As you go, revisit and modify the plan. This can include anything, like learning new languages, moving to a better neighborhood, building new relationships, getting different clothes, cooking new cuisines, etc. I found that as I tried to improve myself, it really just became learning about and experiencing more of the world, and this in turn made me feel more confident moving through the world.
Five: are you a perfectionist? We all have flaws, in every single aspect of our lives. They're always there, and you can never be rid of them all. Accept that you have flaws, and that everyone else does too, and that this is a natural part of life. If you want to change the flaws, make a plan, and start it. But either way, try to accept the flaw not as a bad thing, but as another beautiful part of a unique, individual whole. https://en.wikipedia.org/wiki/Wabi-sabi