Major in sociology to a career in advertising/marketing. Is it possible?

I am close to graduating with a degree in sociology. I am not in love with it, but chose it as my major because it was the most practical thing for me to do (long story).

What I realized too late is that I think my passion is in something like advertising, marketing, or public relations. I’d switch my major but my college doesn’t offer a program in any of those.

How do I transition in to an internship and eventually a career in this field?