There is the thought that the size of your and and the proportion of your fingers makes a difference to how well you play the piano. This is a myth. Fortunately, this myth seems to be dying and in my opinion, it is only older people that tend to hang on to this myth.
Because I have been a piano teacher for decades, watching students hands, I tend to notice people’s hands and this is what I have noticed: the best piano students have hands of all different shapes and sizes. I have had piano students that are rather short and petite, and they have tiny hands. I have seen those tiny hands, on many, many occasions move and stretch over notes as well as any other person. I have seen it so many times that it is not remarkable to me at all. Conversely, I have seen huge, chunky hands, that can move with poise and grace over a piano keyboard and effortlessly create all sorts of sounds and dynamics.
I myself, have small hands and even though there have been times that I had wished for slightly larger hands, because I am 183cm or 6ft tall, my desire for slightly larger hands has been about my hands looking in proportion with the rest of my body, than playing the piano better. My small hands have not been a hindrance to playing the piano. Furthermore, I get my hands from my paternal grandmother, who spent many happy decades playing the piano herself, especially in her retirement years and through to a very old age.
As another point of comparison, both of my sons have medium sized hands with long, slender fingers, which they got from their paternal grandmother. Both of my sons have had plenty of opportunity and encouragement to learn to play the piano, not just from me, but also from my husband who plays the piano too. The older son has not wanted to play a musical instrument, while the younger son has opted to play the tenor saxophone. All three of my children have had so much opportunity to play the piano, but have simply not wanted to. Just because my sons ended up with the so-called perfect hands to play the piano, doesn’t mean they were gifted with the desire to play the piano.
The myth of having the perfect hands for playing the piano is fortunately dying out. If you are one of those people that are holding yourself back from learning to play the piano because you don’t have long fingers, then literally forget about what your hands look like because it really doesn’t matter. It is what you do, not what shape your hands are that determine how well you play the piano.