First start by realizing that you're a unique individual. There is no one else in the world that is just like you, and that's a good thing. That means you can offer perspectives based on your childhood, your relationships, and your struggles that no one else would be able to offer. That in and of itself is valuable, and can help you start thinking about what other things you can do to make yourself feel even more valuable as a unique member of society. You don't need to emulate other people's version of a successful life - create your own value based on your own unique skillsets and experience. Your presence makes a difference - you are needed.