Veryanxious,
Rest assured that assuming your c-peptide is 0.8 nmol/l this supports you are prediabetic type 2, which you were diagnosed as. The c-peptide is used on diagnosis (when you first turn up with diabetes) to support a type 1 diagnosis (not later on.) If it was < 0.25 nmol/l fasting, then this would support you are type 1 (which you aren't) and you would have been tested for antibodies IA2 and GAD (which you don't need to be). In Type 2's if their diabetes isn't managed properly, they can go onto require insulin as their c-peptide results decrease over time, but they don't turn into type 1's.
I hope this helps.
Fasting c-peptide (nmol/l) referenced below:
Absolute insulin deficiency/absolute insulin requirement < 0.08
Likely Type 1 diabetes/inability to achieve glycaemic control with non-insulin therapies < 0.25
Suggests Type 2 or monogenic (MODY) diabetes in a patient with presumed Type 1 diabetes > 3–5 years post-diagnosis > 0.08
Consider MODY/Type 2 diabetes in young onset diabetes at diagnosis > 0.4
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3748788/