I've found experiencing such "negative" emotions to be a sign to me that things need to change.
The emotions are "healthy", in that regard. What isn't healthy, is when they are not followed by positive change, most often including my taking action to effect that change.
(Resent them. Hate myself. Sound familiar?)
In this case, it's reading to me like your larger dev environment is substandard if not defective. Not that that's all that unusual, but you're in a position to perceive it and to understand (from and in terms of your perspective and experience) why.
Either that environment needs to change; is there some way you can successfully build such an initiative in your current environment? Not a "rogue" operation, but something that will be endorsed and reflect positively upon you in terms of your standing and security.
Or, you need to change your environment?
Unfortunately, these days and in tech, being "older" is often a significant barrier to the latter.
Anyway, speaking from experience: Don't let the negative emotions, unresolved, end up consuming you -- while their cause goes or go on their merry way, oblivious and skating by on larger life's externalization of longer-term damages.
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P.S. I reread more closely. Smaller team. You are all "experienced". Maybe their approach reflects different experiences, expectations, even just personalities.
Nonetheless, don't let your negative emotions consume you.
In addition, or as an adjustment to what I said above, make sure you have enough of a life outside of work. Take care of yourself.
It is not your job (heh!) to fix every deficiency (real or perceived) of your co-workers.
Become more of an observer, and observe whether and how their behavior works out -- for them and/or overall.
And start looking for the door you'll eventually use, if it doesn't. Having an out might take off some of the pressure you're feeling, personally.
Best wishes!
And, maybe you'll actually come to perceive a development environment that works while being less "brutal". I'm not taking their side. Just saying, you never know.
I used to be very "strict" about "protecting" myself. Drugs are bad, yadayadayada. I'm still no fan of excess, but I look around me and see that the people who were more relaxed and less worried about such things, seem to have ended up happier and even sometimes more successful in life. Then again, a few of them nose-dived or ended up assholes.
On balance, though, I wish I hadn't been wound so tight, when I was young. I've paid a price for that.
At the same time, I still get quite frustrated by sloppy work that imposes upon co-workers and customers to compensate for its deficiency. Whereas I actually enjoy problem solving and doing things well.