I found this episode of the Philosophize This podcast to be quite interesting:

https://philosophizethis.libsyn.com/episode-072-insecurity

It's about how insecurity is similar in some ways (but also kind of opposite) to morality, or at least the way many people perceive morality. In both cases, you're letting other people's approval or disapproval change your behaviour, and possibly your happiness. Of course, there can be a big difference in the type of approval you're caring about - e.g. being insecure about whether your clothes are out of style is much less serious than a murderer not wanting someone to know they've committed murder.

I think morality goes beyond the approval of other people though, and I think a lot of people perceive morality as being merely the approval of other people.

I'm also probably a person that does what the podcast says people don't really do: constantly think about whether a choice is the most moral choice. I was wondering if it might be because of being aware of climate change that I'm that way, because in the face of climate change lots of little actions that people do regularly, or which weren't possible hundreds of years ago, gain moral weight. But I don't think that's it - I think even without climate change I'd be often thinking about the wider impact of my actions, for some reason. E.g. enslavement of workers or animal rights or genocide, and even pollution without climate change is still pollution.

However, maybe I don't constantly think about morality that often after all: one thing the podcast neglects to mention that seems relevant is the role of habits in morality. If you decide in advance one and for all what a good action is, then develop habits that are in line with your morality, then you've "programmed" yourself to automatically avoid immoral actions and don't need to think about them for each action. E.g. by having the habit of biking / walking to get places I just go places, and don't need to optimize the trip or weigh its benefits against the carbon footprint like I'd do if I drove. It's sufficient to philosophize once in a while to re-evaluate whether your (habitual) actions match your beliefs, as well as to look for errors in those beliefs themselves.

But in many cases the habit of trying to do the right thing can also give you the habit of trying to do what other people expect of you even when their expectations are morally neutral (or wrong). Changing to ignore those expectations has the potential to increase your happiness significantly, by causing new connections with different people. E.g. I can sometimes impress people by rambling on about money, but since money is boring to me, I may be meeting those people's expectations while failing to meet the expectations of some different people who would be more interesting. (But sometimes I ramble on about a boring thing because I can't think of anything interesting to say, and that might be different.)