No worries, I too used to appreciate the EU back when it meant freedom of movement for myself. Even today, they do good things that I wish we had in my country, like forcing Apple to adopt new standards, but they also do things which are kind of shitty and make them a force for bad, in the same manner as the IMF and World Bank. Something especially bad which they have done is to impose austerity upon Greece for example and handicap their recovery from the 2008 financial crisis in order to protect German banks, which is something you can learn more about from former Greek finance minister Yanis Varoufakis' book on the subject "and the weak suffer what they must". This is the book that helped me to understand why socialists are not generally very fond of the EU and its predecessor organisations.

I'm giving you a lot of book recommendations but not telling you where to find them. If you like, you can download Tor Browser and get them for free from z-library.se.