The hardest thing any one person will ever do is decide what they really want out of life. Before you can ever do that, you'll have to know: who you are, what you are, and what you're "good" at."What do you want?" In my opinion, that's the single most good-and-bad question ever conceived by humans. It forces us to compromise with our better selves, eve when we are not inclined to be very generous to others.
When you get right down to it, I'm a visually impaired 20th Century man, which definable limits. When you get right down to it, I am a writer. That's how my mind works. I wasn't always "good" enough to say so, but I have gotten better at storytelling and technical writing over time...because I wanted to. I'm not half bad at organization and planning--but--I'm at my best when I need to put words together. In the long run, I'm only as good at this as I want to be. Medical limitations aside, that's what I really want.
Knowing all these things comfortably has allowed me to plot and scheme my way to where I am now, I am the writer I wanted to be. I do get better at my craft with each new project. There have been times when my eye problems have slowed me down, but they haven't truly-genuinely stopped me. Doubt and uncertainty have made me slow down--they still do--any decision to stop or stand still is mine and mine alone. I do it, or I don't.
Of course, there's more to it than platitudes. In spite of all the setbacks, you've still got to know what you really want, before you can get it. Defining what you want means setting goals that allow you to learn what you do not know, get what you do not have, and learn how to use them in useful ways that make sense to you. We are more than the labels other people use to describe us. There will be days when nobody agrees with you, they won't "see" what you're trying to do. Success is always relative, some wins are big and others are quite small. Every step forward can put you closer to some goal that matters to you. That's how you make your future.