I hate my mf job

my first job is at a franchise and I’ve been working there since year 10 and I’ve always been a hard worker always helping out with chores it’s always been satisfying for me. working at the cafe I think we all know the responsibilities that come with the job and I was hired as a Allrounder but I was also helping with kitchen and I learnt how to do coffee and also learnt how to do pretty good latte art. This was with an Asian owner and they had unfortunately gotten in trouble with fair work because they were underpaying us and didn’t give payslips. Note I was 16 and receiving $14 on weekday $18 on weekend - I actually thought this was really good pay I will not lie and I am aware it is significantly better than other jobs.

my previous boss had to pay a hefty fine and I think that is why they had to sell the business. Another Asian owner takes over and he owns 4 other businesses in Sydney. he comes from generational wealth so spending 500k on a business isn’t a lot for him. I noticed he fired half the employees because they weren’t “hard working” I am now 17 and my weekday rate is $18 and weekend is $22, they have reiterate the importance of balancing shifts across staff and I was the employee receiving 8-9 hour shifts every week (I only work on one weekend day because I’m in year 12 now) I’ve now noticed that I’m getting 4-5 hour shifts now and now that it’s holidays everyone is receiving 3-4 shifts while I’ve gotten 1 5 hour shift. I think I am a pretty hard working person I’m always interacting with customers I’ve created a community with the customers and I do love it, I also help out with kitchen and do barista often when needed. I’m frustrated because of this and $110 ain’t a lot for 17 (not to sound really bratty). I’ve got 16 yr old friend and she does coffee (she isn’t really good but she’s Chinese so they favour her because she can speak - I’m mixed and I cannot speak Chinese maybe that’s a reason why??) she gets paid $26 and she doesn’t all round only does coffee shots and she pushes tasks assigned to her to me.

I’m thinking of quitting because this job is become tiring but I do need money and I’m starting to notice the inequality now..

advice?