I just got my first job

I am 17, and I recently just got my fist job as a busser/dishwasher. I am starting tomorrow. I will be making $9.25 and hour. I am somewhat nervous. I have social anxiety, but I kind of purposely applied for jobs that I thought wouldn't be too nerve wracking. I am assuming washing dishes and bussing tables wouldn't require a lot socially. Also, how should I handle my finances? I don't currently have a car. I don't have my drivers license yet, so I don't have to pay insurance. The job is 12 minutes away from my home, and I plan on just walking or riding a bike. But, I would like to buy some new clothes. Should I save 50% of my monthly income? What should I do?

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