Have you talked to your parents about money related concerns in circumstances other than when your were triggered or either you or them were stressed? Maybe you could could approach the topic from the angle that you are concerned for your family's well-being, and you could use the opportunity to learn about balances wants and income--because this can be a valuable lesson.

Also, it might help clarify if you really need to get a job. For some families, having additional income from a older teenaged child working means the difference paying rent/ eating and not doing so--but in other situations, the child working is just for the child's own benefit so they can have spending or saving money (which has a lot of benefits, don't get me wrong). But work, especially on school nights, can take away from time you need to study. If it might hurt your grades, working might not be a great idea. I don't know what your future plans are, but doing well in school and having extra curricular activities are important for college. Striking a balance here is important.