We play with our finger TIPS.
I know that seems obvious, but we often don’t do it. If we spend some time getting used to this weird use of our hand, playing guitar becomes easier. The reason is this:
The bone does 70% of the work.
When the finger gradually curves to come straight down onto the string, much less energy is needed. The bones of your finger form an arch, which taps down onto the string like a C-clamp with half the effort than if we use the padded bottom of our finger.