It's not uncommon for individuals to project their feelings onto others, and this might be what's happening with your sister. Projection is a defense mechanism where someone attributes their own thoughts, feelings, or motives to someone else. In this case, your sister may be feeling paranoid about being watched, and as a result, she projects that feeling onto you.
There could be several reasons why your sister behaves this way:
Past experiences: Your sister may have had negative experiences in the past where she felt watched or scrutinized by others, leading to heightened sensitivity and paranoia.
Low self-esteem: Low self-esteem can make people more self-conscious and worried about how others perceive them. Your sister's feelings of inadequacy may lead her to believe that others are watching and judging her.
Trust issues: If your sister has trust issues or has been betrayed in the past, she may struggle to trust others fully. This lack of trust can manifest as suspicion towards others, including you.
Anxiety or other mental health issues: Anxiety disorders can cause irrational fears and feelings of being watched or judged. If your sister is dealing with anxiety or other mental health issues, it might be contributing to her behavior.
Sibling dynamics: Sometimes, sibling relationships can be complex and competitive, leading to feelings of jealousy or rivalry. Your sister's behavior might be a manifestation of these dynamics.
Dealing with this situation requires empathy and understanding. It's essential to communicate openly with your sister about her feelings and concerns. Encourage her to express her emotions and fears without judgment. If you both feel comfortable, you can explore the root causes of her feelings and work together on finding solutions or seeking professional help if needed.
Remember that sibling relationships can be complicated, and it's natural to have differences and occasional misunderstandings. Being patient and supportive can go a long way in improving your relationship and understanding each other's perspectives. If the situation becomes more challenging to handle, involving a mental health professional or family counselor may be beneficial in resolving conflicts and fostering a healthier relationship between you and your sister.