Should I quit my current internship?

Greetings, I'm currently a senior studying math and econ. I really want to land a job in private equity but have been having hard times landing interviews and doing well on those interviews. This summer, however, i was able to get an internship at a brokerage firm doing analyst work on forex market.

My job was supposed to update real time news for the website and public research articles from time to time. This was the first finance related offer I got and I immediately jumped at it. But after a couple weeks, I found myself doing mostly translation work (I was hired as an intern for the Chinese site, and since they were revamping their Chinese site, I was asked to translate their education articles one by one for a month). It was a good learning experience about the forex market, but wasn't near what I had expected. I was able to publish some articles of my own after then, but everything I do everything is in Chinese not English, which IMO is not very helpful as I want to stay in NYC after I graduate.

I have since found another internship for the spring semester next year at a VC doing Financial analysis, data acquisition, machine learning work, which I think is more helpful for me to break into private equity. So my question right now is if I should quit this internship right away since I feel like I'm not learning a whole lot and I've already worked here for 4 months, so I will still have something to talk about when I'm interviewing for other companies in the future.

Overall this internship has become more exhaustive than learning. I tried talking to my boss about quitting last week (I mentioned that I wanted to stay focused on school work and the internship was eating up too much time, but not that I found another internship for the spring), and she told me that I can work less hours but hoped that I could stay, I was feeling bad so I said yes, but I still want to quit soon since I want to go back to China for holidays during the winter. Is this a bad timing since I just said yes I would stay last week? How should I go about quitting? And will this affect my future career?

Btw this internship is paid, close to minimum wage but nonetheless. and the VC internship I found won't be paid.