Here's a great free course: https://www.coursera.org/learn/thermodynamics-intro
Khan academy has incredible videos to teach you the algebra you'll need in thermo, and calculus too to the extent you need it. Now is a better time than ever to self teach, there are endless resources. Libgen.is has a lot of free (though pirated) textbooks. YouTube is packed with videos.
Have fun learning! If you're motivated and interested, your background doesn't matter; you can learn anything.