Masters or PhD? I got my masters and it was pretty easy. Stressed at times, but not too terrible. I'm now working on a PhD and I am 90% sure I am going to quit. While the financial outcome is potentially pretty good, I have no work life balance and probably won't until I get tenure somewhere (which is 10-11 years away). The PhD work is so much more different than I anticipated. It's not so much a thought of "can I actually finish this thing?" To "do I really actually want to finish this thing?" I have a 4.0, but that doesn't mean anything until I can prove I can publish. I'm sure graduate school is perfect for some, but that doesn't mean that it is for everyone. Like you, I don't like most of what I do. I thought the feeling would pass, but now that I'm almost 1.5 years in, I'm almost certain I'm barking up the wrong tree. There is no shame in quitting, but make sure you have given your program a fair shot.
Bottom line is that I see fellow students and faculty members who are wasting some of the best years of their lives. All for what? So you can end up as one of the other narcissistic academics who get off on one upping one another as you spent your Saturdays and Sundays pouring over research? If that is your thing, do it, if it's not, run away as fast as you can. One more thing...if working as a professor is your plan, you might want to think a little bit about where higher ed will be in the next couple of decades.
It has become a straight up business, and kids are realizing that it might not be worth it. Tenure positions are being cut left and right. Schools are hiring less and many will be turning to video recorded/online classes (meaning that unless you are a stud in your field, getting that good job is going to be super tough). Doesn't look great...