Your BMI is 20.9, which is considered optimal-to-low. However, BMI is far from a perfect measurement of health, and is mostly useful for diagnosing extreme under or over weight. In your case, if you're visibly pudgy/fat, you probably lack lean body mass and have a high body fat percentage. For someone of normal BMI, body fat percentage, waist circumference and waist-to-hip ratio are likely to be more useful measures.
Since your abdomen is thick, you probably have a lot of visceral fat, which is the absolute worst kind of fat to have. It's one of the main risk factors for metabolic syndrome and diabetes.
As @informaticker mentioned in the comments, the fat loss advice is basically the same as for an obese/overweight person, but since you (probably) lack lean mass, strength training is especially important. You probably don't need to lose weight: you need to gain muscle/lean mass and lose fat. I'd suggest a high protein diet