Why was Jade always mad in Victorious?

Why was Jade always mad in Victorious? It is shown throughout the series that deep down, Jade is lonely, sad, insecure and her heart is broken, which is part of the reason she is so rude towards people.

It is shown throughout the series that deep down, Jade is lonely, sad, insecure and her heart is broken, which is part of the reason she is so rude towards people.