> Yes. Discipline is purposeful pain seeking. Procrastination is pain avoidance.
? I'm not sure I can ever agree to that. Discipline is more about having commitment to a thing.
It's not about grasping nettles each day until you develop a callus, it's about doing something you have some interest in some way until you get better at it.
No professional sports player ends up professional in the field because they hate sports. No professional musician ends up that good and trained because they hate music. No scientist ends up good at their job because they hate it.
It's not about seeking pain, if you've convinced yourself it is you will likely burn out as you're not following something you actually enjoy or have an interest in. You may have found disciplin in that, but frankly it will just be 'disciplin to embrase pain' which may be another skill in and of itself.
Don't get me wrong, loving science doesn't prepare you for the hours you will spend getting your head around the maths that underpin it. No love of sports will prepare you for waking up with your muscles exhausted. No love of music will prepare you for freaking out when you can't get that the right notes or timing on a piece after days of effort.
These are not the things you're developing a disciplin in. And imo is dangerous to mistake the fact that tou are. You're developing a disciplin in the topics you enjoy and discovering the real world (unfortunately) isn't all about disney musicals. (Which if you assume it is, sorry buddy, you're not going to be randomly selected to join NASA to go to the moon tomorrow, you're not a trained test pilot/astronaught)