One thing I have learned as I get older and gradually learn more about psychology and neuroscience is that we are all very different from each other. In most cases, very very different from each other.
We don't notice it because people work hard to fit in and behave like everyone around them, plus we tend to spend most of our time around people who have a lot more in common with us than the average. As an office worker in a city I don't spend much time with manual labourers from the country, and far less time with uneducated villagers. When I do spend time around people that don't have as much in common with me, like if I meet the husbands of my wife's friends for example, I tend to find a topic you are both interested in and just stick with that. There are lots of people I am friends with that would drive me crazy if I had to live with them - they're that different to me and these are my friends!
It is widely recognised in productivity research that we all have a very limited amount of self-discipline per day, and constantly using it all the time is a big predictor of burn-out.
So I'd say that you think it's a choice because it's a choice that isn't that far from your natural behaviour, preferences, habits and values, and so for you it isn't a very difficult challenge to overcome with willpower, but that's not the case for everyone, or even a great many people. There are likely things that I think are easy that you would find completely impossible, and vice versa.
I mean heck, it's pretty obvious from these forums that a lot of the time we can't even stretch our thinking to how differently other people like to use their cameras!