Keep working and figure more out.
It's probably not as doom and gloom as you might think. You might be off (and probably are compared to what you'll figure out and realize later).
Besides the "what IS right now" assessment being off, your goals might be off too. What you're expecting might not be realistic, for you, for anyone. Or the goal might be more difficult than you think. Or what you think others are doing (already achieved that goal) might not be true -- You might just be thinking they achieved that goal but they only have the appearance of it sometimes.
You can't predict the future. Good or bad, you don't know what the situation will be like tomorrow (future tomorrows). There's a good chance whatever you think/predict will happen won't become reality. Some good, some bad, but probably different than what you'd predict now.
Everything is changing, including you. The piano, the music doesn't change, but you brain and body will. The situation in the future might be different and you brain/body may have adjusted. Whatever you're concerned with now might be irrelevant in the future. (You'll probably be worried about and focusing on other things.)
So why worry about it? It probably won't help. You have to put some effort in to make improvements, so do that. And then hope for the best. Adjust as needed.
And watch out for yourself. Your own thinking can hold you back, esp. if it's adding things up to make it sound hopeless a bit like I sense in the first post. (That's not necessarily bad. If you get bummed out, you rest/recover more, and then you're ready to go again later.)