I am asking myself the question "Should I do PhD or should I leave academy and go for industrial career?"

PhD is surely a bite that not everyone can chew. But I wonder who can chew it?

I never was good at tests and exams. My BSc. GPA was 2.84/4.00 but finished my MSc. with 3.50/4.00

However, currently I am working on a conference paper and I feel like even that is too much for me. It has been nearly 3 months and still, the paper draft is to be improved (not the wording but the content).

I am surely a hard-worker but not always. Sometimes, I let go of my work and absorbed in other stuff (composing, amateur radio etc). If this period is too wide, I have to spend double effort to warm-up and remember where I left.

I don't know how things work in PhD. It usually is 5-6 years. It is the one of two most-challenging milestones in academic career (the other is getting the title Assoc. Prof).
Should I completely be a "nerd" and work on my thesis systematically (something I could never make in my entire life) or working periodically but with extra effort is still sufficient?

So, here's my question: If I say "I'm considering to do PhD" and ask your advice, what would you ask me? What kind of skills/characteristics do you look for a potential academician?

I know it is way too late for me to ask this kind of question, as a person who almost finished his master's degree. But better lose the saddle than the horse.