Crestor or not?

Patient: 39yr old f type 2 diabetes (a1c 5.7) cholestrol 188 LDL 122, hdl 38, tryg 143 trying to quit smoking and adding exercise. Dr prescribed 5mg Crestor but I am Leary on taking the pill can I with diet, quitting smoking and taking fish oil and b complex bring my numbers to a better range vs taking the Crestor? Also I take a half of a 500mg metformin daily.