No I do not like working with people. I would aim for surgery or radiology for this reason.

While the stereotypical surgeon may be gruff/demanding/efficient/decisive, most surgeons are required to work in and even lead teams. The profession selects for aggressiveness and confidence, not for loners (though there are obviously some in any profession). Medical training prior to specialization will be exceptionally challenging if you dislike working with people.

Pathology might be a medical specialty where you were able to indulge your love of biology while working in relative solitude, but that's a pretty narrow slice of the pie to target. Per your concerns about ROI, radiology is probably the medical specialty in the US most likely to deflate in the next several years, given that wages are exceptionally high and that there are few material barriers preventing radiographs from being read by physicians in other time zones, or even other countries.