Learn to banish the word "should" from your vocabulary.
One the one hand, do you really have so many "responsibilities"? Where did they come from, anyway? And if you start dropping them because there're too many of them to handle, how is that better than just cleaning disclaiming some of them in the first place?
On the other, there are many, many things that can be great learning experiences. Until you try to do too many of them at once, and then you'll be too busy to learn anything from any of them.
Bottom line: do less. Live more.