concerns for the market

In the last 6 months I have watched my friends family and colleagues pull the entirety of their shares most at a loss over concerns with the market (gfc) and today another colleague was informed by her accountant to pull all her shares saying the bubble is about to burst and the market is mimicking that of 2008 2009 trend. Now Im just a primary school teacherand am not informed enough on these matters but I have to admit I am beginning to worry that I am the only one still holding. I was wondering if anyone on here could enlighten me further.
Much appreciated