Sometimes blockages are thrown in our way.
According to this book (that I read this weekend)... part of the reason for this is that you are (in fact) doing what you need to be... and that "resistance" is making these blockages... stumbling stones in the form of other people, minor tasks, procrastination, etc. in order to deter you from your path.

According to the author(Steven Pressfield), "The whole aim of Resistance, is to prevent you from doing the work you are called to do. Resistance wants you to take it easy, to be ordinary and mediocre, to take the low road. Resistance is the reason so many people place a basket over the brilliant candle that shines within them. The fight against Resistance is, Pressfield says, a war to the death."

Now, I'm don't ascribe to all the philosophies that Mr. Pressfield believes in, and that is OK.
But he does have some points about resistance.

As an example:

"Resistance is Insidious. Resistance will tell you anything to keep you from doing your work. It will perjure, fabricate, falsify; seduce, bully, cajole. Resistance is protean. It will assume any form, if that's what it takes to deceive you. It will reason with you like a lawyer or jam a nine-millimeter in your face like a stickup man. Resistance has no conscience. It will pledge anything to get a deal, then double-cross you as soon as your back is turned. If you take Resistance at its word, you deserve everything you get. Resistance is always lying and always full of shit."