I can offer some general insights that may help you understand this feeling better.
Chemistry and Connection: There might be a unique chemistry or connection between you and this particular girl that you haven't experienced with others. This connection can lead to intense feelings and thoughts about her.
Shared Interests and Values: If you share common interests, values, or goals with this person, you might feel more drawn to her as you feel a deeper sense of understanding and compatibility.
Physical Attraction: Physical attraction can be a powerful driver of feelings towards someone. If you find her particularly attractive, it might intensify your feelings.
Emotional Bonding: If you've shared emotional experiences or vulnerabilities with her, it can create a strong emotional bond that contributes to your feelings of obsession.
Uniqueness and Mystery: Sometimes, people become obsessed with others because they find them mysterious, unique, or hard to understand. The desire to unravel this mystery can lead to obsession.
Idealization: You might idealize her, focusing only on her positive qualities and ignoring any potential flaws, which can contribute to your strong feelings.
Past Experiences: Your obsession might be related to past experiences or unresolved feelings, where she reminds you of someone else or symbolizes something important in your life.
Lack of Distractions: It's possible that there aren't many distractions or other romantic interests in your life at the moment, causing your thoughts to center around this particular girl.
Validation and Self-esteem: Sometimes, being obsessed with someone can provide a sense of validation or boost self-esteem, especially if they reciprocate your feelings.
Intrusive Thoughts: Obsession can also be caused by intrusive thoughts or patterns of thinking that are difficult to control.
It's important to recognize that feelings of obsession can be intense and overwhelming. If these feelings are causing distress or negatively impacting your well-being, it might be beneficial to talk to a mental health professional or counselor who can provide support and help you process these emotions in a healthy way. Remember that it's natural to have strong feelings for someone, but it's crucial to maintain a balanced and respectful perspective in any relationship.