The shade finds you, not the other way around
Here's the part nobody at the counter tells you: not one tube in that display was mixed for your skin. The pigment in TrueShade is pH-reactive. It goes on almost clear and, within a minute, settles into the rosy tone your own lips are made for.
Two friends can wear the same tube and get two different shades. That is not a gimmick. That is the whole point.