I graduated college with significant, real-world programming skills

I don’t mean this as a slight against you because there’s a place in the world for every type of developer, but your description of work and collaboration is very cynical. You could be the most unlucky person in the world and thus you’ve never met anyone worth collaborating with, or, more likely, you’ve not attracted those people in your workplaces. I’ve worked at great companies and awful companies, and no matter what, I have always met talented people in these companies who I’ve been able to build meaningful professional relationships with. Even in the most toxic hell-holes, there’s people worth learning collaborating with — across all disciplines. The most valuable work you can do when in software engineering is to help non-swengs in businesses achieve their goals: code is just a means to an end, collaboration is how we discover what to build.

One thing I got out of mentorship is that it’s one thing being correct, and and entirely other thing having people actually want to listen to you. It happens often enough that you have one and not the other. Until you have both, you won’t have impact and will grovel about others.