I’m guessing ‘pain’ is a reference to the personal sacrifice, struggle and effort involved in getting to a level of ability/knowledge that allows you to compete on a professional level. As someone who deals with actual physical pain much of the time I find study and work a good distraction, it’s almost a form of therapy for me, so I can’t directly agree that that’s really the case but I think I get where you are coming from.
To be blunt though, the only person who can really answer that question for you is yourself. Others can give you their opinions and discuss their experiences but that has no real bearing on anybody else as we are all different mentally, culturally, emotionally etc. If the work you do doesn’t give you the sense of satisfaction that you need to make up for the late nights etc then maybe you do need to consider other options. Life is short and it’s important to do what you enjoy if you can. All pain and no fun is not the way to go.
Just my 2c of course…