It has never been easier to keep up with the latest technology. The key is to look at it and read it. Every piece of software in the last twenty years has had the instructions written - and sometimes shown with pictures - right on it. You don't need to have someone show you how to use it, and you don't need to sit in classes or read books about it. You just need to look at it.
Stop trying to memorize every button! There are just too many, and the buttons on your computer will continue to change. If you want to change right along with the technology, just look at it. Take a moment to read it, or look at the icon. Your nephew who can do things on your cell phone isn't a genius - he just knows to take a second or two to read. From that you should realize how easy all of this stuff is.
If you've ever played video games you know what I mean. If you haven't, well, give it a try!