Is it important to have a part time job during college?

I'm 18. I am currently attending a community college. I'm an engineering science major. I am taking two summer courses. I recently finished one and am starting the next one in a few weeks. I've never had a job before and I feel that I don't have the time for one. Every semester I am busy with a lot of homework, focused on studying and maintaining a 3.8-4.0 GPA. I become stressed easily as well! School is my priority. People always tell me that my mentality should stay that way. I agree but I feel a little self conscious about not having a part time job. My parents want me to focus on school work as well. I try to help my parents save up money by taking public transportation to school, buying cheap clothing, saving electricity, and even trying to sell my old textbooks. I also try to show my gratitude by helping around the house or running errands whenever I can. The only work experience I have is community service.... Is a working a part time job important during the college years?