Balance

Nobody wants to do a leisure activity that isn't fun. However, if you want to progress in grappling, you're going to have to work, and it will probably be difficult. You have to find a balance. It's not always easy to do, most of the time your coach has been jiu jitsu for such a long time that the grind is the fun part. They've gotten smart about how to train to keep themselves intact and enjoy putting the effort in every day. Their version of fun is not that of the general populace. Try to enjoy your training, it's not life and death, work hard, but don't sacrifice your well-being to grappling if it's not going to be your career.