I know many, many people who do not finish their doctorate and they are all doing very well. Do not work on a PhD if you aren't enjoying it.<p>A PhD is not just a few classes. It is a deep apprenticeship to a noted expert in a field. Unlike most graduate degrees which have 96+% graduation rates, PhD finishing rates are very low.<p>I'll admit any PhD has its ebs and flows. There were many hard years during my studies. But overall, it simply is not worth 5+ years of your life to pursue something that you do not love to do.
I never started, but I did drop out from my masters in mathematics with just enough credits sans a thesis. I'll say for my case it was fortuitous as I exploited every opportunity I had to the fullest.