I am definitely colourblind but onl

I am definitely colourblind but only for some colours! I can still tell the different between the colour of traffic lights and the difference between red and yellow and orange(usually) and green and stuff but sometimes i get confused with certain colours. for example, a lot of times i mistake purple for blue!!! so I will pick something out that is purple and i think it is blue and then i have something purple and i dont like purple!!! T^T