If you quit now, will you be able to get a master's degree at least? You're only 2 years into your degree. Which means that if you quit, you haven't lost too much time, yet. You also managed to learn some programming. Most PhDs take over 4 years to earn. Do you think you can realistically survive a minimum of 2-3 more years like this? If you quit, do you have any idea what you want to do? Have you looked at jobs that interest you? Are they available to you now, or you need a PhD to apply for any of them?

I have a PhD and it took me far down a road I no longer want to be on. My friends without PhDs on average have less stressful lives and were building up coherent work experience while I was doing research that has very little to do with my current work. My story is not your story, but there is a huge opportunity cost involved in pursuing a PhD. Personally, I wouldn't do it again.