You are probably thinking that your setup is fine. It just might be, but I doubt it. If you have the courage, set up in front of a mirror and check for the following three essentials. Before you say yes, let me elaborate a bit. For any golf shot above, say, a six-iron, the insides of your heels should be the same width as the outside of your shoulders.
Golfers have a tendency to think about the outsides of their feet.
They also have a sort of paranoia about having too wide a stance. Nine out of ten golfers play from too narrow a stance. You will be unable to shift weight,or balance, from a narrow stance. If you cannot shift your balance, your golf swing turns into garbage, especially under pressure. They should be.