It's a violet, not a purple technically. Purples tend to be bolder, and have a closer 1:1 Red to Blue mix; while Violets are more Blue, and often softer.

You may also be a bit colorblind. Not everyone sees color the same, even among the population who is not diagnosed colorblind. Determining color is also a skill akin to tones in music. It's a combination of skill and innate ability to determine them.