Immature?

Ok, so when I read my brother's blog today, it got me thinking. He stated that he thinks that people who are afraid to change, esp if it is for the betterment of a group are immature. I am not sure that I totally agree with that. I have contemplated changes in my life and, at times, TOTALLY believe that they would benefit lives. BUT after much self deliberation, decide not to make the change. I told him that maybe I just over contemplate the change and scare myself out of it, but does that make me immature? Not so sure.