And it is not in your individual controll to engage with experiences or not. Being soldier is opposite of making individual choices. You do a lot in groups, group conformity and group cohesion are bug things, you get told what to do.
I don’t know your age or experience, but what you said doesn’t ring true to me. If you’re deployed to a non-combat zone you don’t just get a day off every couple weeks. You have liberty most nights and weekends, at least if you’re not actually stationed on a ship.
It’s no different than college. You can be the person who just holes up and plays video games, or just go out in the same groups without exposing yourself to different ideas, or you can get out of your comfort zone. I’ve known people who made the most of their free time by regularly volunteering in local clinics/emergency rooms, lived outside of base in the city with locals, exposed themselves to local culture etc. There’s more freedom than many think. And this is coming from lower enlisted ranks of one of the branches with a reputation of being more disciplined and strict.