Diabetes symptoms?

I had posted a question earlier in the week reguarding frequent urination and some boils on my skin. I was wondering if this could be the onset of diabetes? I was tested in mid-2005 for diabetes. My fasting glucose was 96 and my random test was 118. My uring anyalysis was negative. Can a 24 yr old develop diabetes un just 2 years? Im about 30 pounds overweight and excersice moderately every once in a while. Do eat a lot of carbs.