Recommendations before traveling to Europe

The most visited countries in the world are in Europe. In my case, the continent was never a priority among my destinations. When I started traveling, I dreamed of distant and exotic places (that is why, perhaps, I went to Asia rather than the more “traditional” places) and Europe seemed very touristy and a bit boring. I had the typical prejudices: "It is expensive", "it is too tidy", "it will remain the same for several decades", "is to know when you grow up" (?), "Is to go to see museums and ruins", "is an easy destination. ” Error. ERROR (would hit me). Now that I know her, I feel that I came at the right time of my life: everything happens in Europe and I love to be enjoying it at this age (almost 30).