They draw your attention to things in your life that are damaging you. They pull you towards things that will help you. In this sense, they should be listened to and heeded. However, emotions are not always correct. Sometimes, they signal danger where there is none, or they give you the desire for something harmful.
Emotions can be incorrect for several reasons.
Your brain only has a finite number of programs dictating what emotions to feel in what situations. When you encounter novel situations or subtly different ones, your brain compares it to older situations and responds with the old emotions, even if they don't make sense anymore. However, many situations that do not threaten us physically elicit this response, causing us to want to run or fight when such behavior would get you into trouble. The bottom line is that how you feel about something is not necessarily a sign. If someone makes you feel creepy, you might just be responding to an irrelevant characteristic, like their hair style.