I can vouch for the Design of Everyday Things too (granted I got the advice from another HN post). It's a brilliant book that exposes you to some of the common pitfalls of product design and gives you many mental frameworks to work with to embrace your designs' shortcomings and, most importantly, address them.
On the other hand, if you want a lighter introduction to design, try watching one of Gary Hustwit’s films like Helvetica, Objectified, or Rams. Or read the Design of Everyday Things by Don Norman.