I have been through the same problem myself. Too many interesting things to learn and too little time. What got me through it was to ask myself "Why?" 3 times for everything I was excited about and wanted to do. And I realized that only a few of those things I REALLY deeply wanted to do. I basically discovered my "life values". What I truly deeply cared about. And the moment I reached this core, everything became clear as to what I should focus on. Here is a practical way to do it: Write on a piece of paper: "I want to do X!". Then next line write "Why?". Write your answer. Followed by a new question: "Why?". Answer that one. Keep going until you can't answer the "Why?" anymore. And then do the same with everything else you want to do. Don't show it to anybody else. This is for yourself. So you can be brutally honest. Try it and see what happens. You might be surprised.