A few, including Architect, have managed to find careers that have enough challenge and facets to avoid the boredom part. Most of us, not so much. And it can become extreme.
Thanks for the mention. I actually am bored with my present workplace, for the most part, but it pays so well and is so easy ('golden handcuffs') that I stay. It allows me to pursue other interests (in my field and outside) Really I'm building a 'post day job' business, working for myself with a nest egg buffer.
I've said elsewhere that I think INTP's (myself included when younger) obsess too much about the big What (What am I Doing?), not realizing that it's really the details that matter in how much they like their work and life. For example, I work in a technical field, I think most INTP's would, if they had the background, enjoy. But jobs range from good to bad, and how good a job is depends on the person too. For me at this point in my career, I get a ton of autonomy, working from home most of the time, and am self directed - this is good. When I was younger, I was a lead engineer and traveled the world on the company dime - good for that time. I didn't have the maturity back then to handle the job I have now, and now I have no interest in bossing a team and traveling the world.
So find something your interested in (technical if you have any background for sure) and the key to passion, interest and lack of boredom is finding the right circumstances. My son is an INTP, for sure I'll be teaching him this (though he is following right in dads footsteps and I'll probably work for him one day)
Edit: I should say, that part of the reason why I love my field (computers) so much and stay with it, is that I did try my hand at everything that interested me. In order of seriousness, software, music, physics, photography, writing, art, audio engineering, and a load of other ones. The first three I achieved professional level, but my career has been in software, I do music now for personal enjoyment (precious little time for it), and do photography quite seriously.
So what I'm saying is that it ultimately did help me to find my real passion, because I finally noticed that while trying all these things, I've always been a computer nut.