At any given point in time, your best can look different. This applies to the songs and pieces you’re learning right now and in the future.
Maybe you’re not able to play the song/piece you want at, say 100% of the ideal version. Maybe right now, you’re only able to play it up to 40%, 50%, or 60% of it. And that’s perfectly okay.
Maybe in the future, when you come back to it, you’ll be more skilled to play it at 70%, 80%, or even 90% of that version you strive to sound like. When that day comes, all your past practice sessions, time and effort will feel much more worth it. It would feel blissful, even. A taste of glory.
So don’t be discouraged if your dream song(s)/piece(s) is(are) too hard for you right now. Do your best now, and get it to that 20%, or 30% anyway, as I did 4 years ago. I still struggle to play my dream piece at 100% of that version I aspire to, but at least I can play it at, say, 60% of the way. It feels blissful even, to take it to classes knowing I can work on it now at a higher level, and to my performance classes where I get to ‘premier’ and receive constructive feedback on it. I aim to get it to as close as 100% by next April for my graduation recital.
This improvement only fuels you more and gives you so much more confidence. To me, it’s also a source of happiness and satisfaction.
It’s a never-ending climb. You only get better when you keep going. You can even take a lifetime to do it. There’s no rush.
So don’t worry about not being able to play it well now. Learn it as best as you can now, and when you come back to it years later, it’ll be ever so familiar that helps you pick it up and improve at a much faster rate.