Why do I keep feeling that I don't have enough pens and highlighters when my pencil case is already full of them?

Because you are fooled into thinking that quantity is better than quality. You should try working with just one or two colours and making the most of them.

cause you like having a lot of thern, just get sorne rnore

Scribes, Far Eye Sees, Sad You Sees.

Scribes and Pharisees and Sadducees

You can never have enough. When I buy pens or markers, I always choose the pack that comes with the most colors.