The thumb is wide and short, and the biggest pipa nail is too narrow. What should I do?
Don't buy those tortoiseshell nails with big curvature. It's usually curved. See if there are any flat nails, so it won't be too uncomfortable even if it is narrower than your fingers. If not, use sandpaper or nail file to polish it. In fact, as long as they are uncomfortable, most people's nails are not so suitable.