Is it great to invest in stocks and an Index fund or just in Index Fund?

I am invested in YUM, GIS, GCC, KO, BIDU, VSS or Vanguard international smallcap ex us, EWC Canada Index and XOM. Have VASGX Vanguard Growth Life cycle Index fund. Is it better to be just invested in VASGX and not stocks? What is your view of the economy and when the next crash will come? Next bubble? I am 27 and make less than 20,000.