Not trying to be offensive but what you are trying to do is to run a single player game inside of an MMO and complain that it isn’t really working well. When you “just” do your personal storyline you’re more or less invisible to the rest of the world and an MMO that actually gives an MMO experience requires users to be “in the world” rather than inside their private instances.
So therefore it seems logical to me that ANet one in a while tries to get you out of that private instance and puts you out “into the fresh air” so that you can participate (i.e. HELP other players) with events and such.
If this is not at all to your liking than maybe you play the wrong game and would be better off with, say, Skyrim or somesuch single player focused game.
I have so much fun in the world that at one point my character was level 70 while my storyline was at 40something. After all – your storyline is always there and waits for you but who knows when that world boss is making his next appearance … ^^