Of the bachelors, masters, and PhD, the masters is by far the easiest to get. Academically, if you did fine in undergrad, you'd probably fare well there, too. But I wouldn't pursue one unless you were about 75% sure about where you want to head. There's no time to go "undecided" as your major like you could in undergrad.
The fields you listed are all non-technical and do have a bit in common, draw from similar skill sets, etc., but.. yeah, you don't want to get halfway through a masters in sociology and then decide you wanted to go STEM. By and large, masters degrees are much more specialized than undergrad ones. For one thing, you don't usually have "general education requirements" like, say, how an undergrad mechanical engineering program might put you in a poli sci class or something.
I had also set my sights on a PhD when I was young.. at 18 or so I had a bucket list of things I wanted to accomplish. PhD was one of them. As I went through the masters, it finally hit me that I should figure out whether going further to a PhD would actually be worth it. I had a better sense as to whether and how to course-correct.
I explored my options, etc. For what I wanted to do, it was worth it anyway. Researchers by and large get paid beans until they get one. And nobody cares about a grant proposal from a Mr. Smith... especially the stuffy NSF folks..
Some companies explicitly count a relevant masters degree as, say, 3 years of experience. Sometimes it's a heuristic, sometimes it's a policy.
The masters was easy enough (at least, compared to undergrad) that I just decided to just blow through it full time while working full time, just so I could double-dip that whole time. People usually have a masters or they have experience. It also gave me a very firm grasp on what my career would entail. I've known too many students who simply went straight from undergrad into a GTA program, earn their degree, then find themselves out there with no sense of what their career would look like. (But of course if you're going into research, you obviously get research experience.)
All this is to say, I guess, that if you have a wide variety of interests and absolutely cannot decide where to go, you'll want a better grasp of that first. But when you do, a masters could very well be worth the investment.