It's symbolism to describe aspects of self-knowledge, consciousness and yes even personality. Tarot also has this symbolic reference to ourselves.

It's not 100% accurate, it's a personality model of approximating certain traits the can be applied in various degrees of accuracy to different people. I find many aspects of myself in other signs, not just my own. It's not truly accurate to describe yourself. It's symbolism to describe parts of ourselves. To learn about the general qualities and characteristics of consciousnesses, to know-thyself of the human condition in a general ways.

Take care. Peace.