I can offer some general possibilities as to why someone might be shy around you:
Introversion: The person may be naturally introverted, which means they feel more comfortable and energized in solitary or low-stimulation environments. They might find social interactions, especially with new people or in unfamiliar settings, somewhat overwhelming, leading to shyness.
Lack of confidence: Shyness can stem from a lack of self-confidence or self-esteem. The person may feel unsure of themselves or be afraid of being judged or rejected, leading them to be reserved or cautious in social situations.
Attraction or interest: Sometimes, when someone is attracted to another person or has a romantic interest, they might become shy or nervous around them. The fear of making a wrong impression or being vulnerable can lead to shyness.
Past experiences: Negative experiences in the past, such as rejection or embarrassment, can cause someone to develop shyness as a defense mechanism to avoid potential hurt or discomfort.
Cultural or social factors: Cultural norms or upbringing may influence a person's behavior and level of comfort in social interactions. They might have been taught to be reserved or modest, especially around new acquaintances.
Social anxiety: Shyness can also be a symptom of social anxiety disorder, where individuals experience intense fear or anxiety in social situations.
Remember that each person is unique, and shyness can have various underlying reasons. It's essential to be patient, understanding, and respectful of others' boundaries and comfort levels, allowing them the time and space to feel more at ease if they wish to engage in more open interactions. If you're interested in getting to know someone who appears shy, being friendly and approachable can help create a comfortable atmosphere for them to open up if they feel inclined to do so.