It's too large of a risk for someone out of uni with no real world experience to start investing what little money they have without linear income to pay for their everyday expenses. Sure, *some* do succeed, but I'd say this is rare. Businesses failing within their first year can be as high as 90%.
Personally I didn't start investing until I had a reliable source of income, sufficient capital, sizeable amount of credit available and having worked for several companies - observing their day to day operations, what works and what doesn't, speaking to executive members of the business and people who've been there done that.