The response to "How are you doing?" can vary depending on the context and the relationship between the people involved. In many casual or social settings, when someone asks how you are doing, they are often using it as a form of greeting rather than expecting a detailed, personal response.
In these situations, it's common for people to respond with a simple and positive reply like "I'm doing well" or "I'm doing good," even if they may not be feeling particularly great. It's more of a polite exchange rather than a genuine inquiry into one's emotional state.
However, if the person asking the question is genuinely concerned about your well-being or you have a closer relationship with them, they may be more receptive to hearing a more sincere answer. In such cases, you can decide whether or not you want to share more about how you're actually feeling.
Ultimately, it's important to read the context and the person's tone to gauge whether a brief response like "I'm doing well" is appropriate or if they are genuinely interested in knowing how you're really doing. It's also okay to be more open and authentic with your response when you feel comfortable doing so.