I consider myself an introvert as well, and quite frankly don't even think about things like company retreats etc. in my business. When we had lots of employees, even things like company Christmas parties or after work drinks would fill me with dread and I would just turn up out of duty. I would never organise them or enforce them, but simply go along when someone else did.
However, I've learned in all these years that for some people, this is actually what makes them tick. They thrive on such 'company culture' and the chance to let loose a little outside of the workplace. Each to their own. The sight of other people doing things they love shouldn't fill you with toxic feelings. Make you slightly uncomfortable or disinterested perhaps, but anything more than that, and there are probably deeper issues at play that probably need to be resolved in yourself, rather than externally.
However, I've learned in all these years that for some people, this is actually what makes them tick. They thrive on such 'company culture' and the chance to let loose a little outside of the workplace. Each to their own. The sight of other people doing things they love shouldn't fill you with toxic feelings. Make you slightly uncomfortable or disinterested perhaps, but anything more than that, and there are probably deeper issues at play that probably need to be resolved in yourself, rather than externally.