Roughly speaking there are only two reasons you do anything in life:Because you want to.Because someone else wants you to.
The first category of internally motivated activities might include things like eating, socialising, hobbies and going on holiday. The second category of externally motivated activities might include working a job, studying, or loading the dishwasher.
The reason I say 'roughly speaking' and 'might include' is because the two types of motivation can be difficult to disentangle. Yes, you enjoy your work, but would you do it for less money or for free? Maybe, maybe not. Yes, my wife wants me to load the dishwasher, but maybe I'd do it anyway. Or maybe not.