I don't monitor the memory consumption on my Mac that closely so I don't know what is normal for each process, but I would agree with @John Galt that Google Chrome (or any browser for that matter, but especially Chrome) will use a LOT of memory because each Window (and perhaps even tab) is sandboxed to add to the security of the browser. This overhead uses up a lot of memory. Plus a lot of web pages contain a lot of code and advertising which quickly zaps memory.
If you won't post the EtreCheck report there isn't much we can do to assist you in understanding your system because we don't have the details necessary since we cannot see the computer first hand. The EtreCheck report by itself isn't enough to know your system is Ok as it needs to be analyzed by someone familiar with the various apps and even the hardware itself. You can either post the report here for other experienced contributors to analyze for free or you can pay to have the developer analyze it for you. The report will alert you to possible adware, but it won't alert you to issues with questionable apps or "semi-legit" apps that are known to cause problems. The EtreCheck app is only designed to collect an anonymized snapshot of the hardware and software installed so it can be posted here to be analyzed.