You don't need a statin unless you have Familial hypercholesterolemia. Or your Cardiovascular risk is high or you have diabetes for 10 yrs or age 40 with diabetes. Based on your age, you are very unlikely to be high risk for cardiovascular disease.

Your cholesterol levels r indeed high which requires attention and evaluation

There are many reasons for high cholestrol. It can b either familial, lifestyle related(obesity/ sedentary lifestyle) and metabolic syndrome associated. As your cholesterol levels are very high first treatment is always diet and lifestyle. Reduce your weight, eat healthy and exercise regularly. First treatment is always lifestyle modification if u have no other comorbidities like diabetes hypertension or heart disease after 2 months of lifestyle therapy still cholestrol doesn’t come down then can start on treatment.