This may be due to a psychological phenomenon known as "projection bias". People tend to think that others see themselves the same way they see themselves. When you think a girl is good-looking, you may unconsciously assume that she is also attractive to others, including yourself. Therefore, when this girl smiles at you or shows friendly behavior, you may mistakenly interpret it as she has a special crush on you.
In addition, people tend to be very sensitive to their own interests and feelings, and less sensitive to the true feelings of others. This "egocentric bias" can cause you to focus too much on your feelings and ignore other possible explanations.
Another possibility is that people tend to look for people who are similar to themselves. This phenomenon is known as the "similarity-attraction principle". If you think a girl is good-looking, you may look for common ground between her and you, creating the illusion that she might like you.
Finally, people sometimes see what they want to see because of their desires, which is a form of "confirmation bias." If you want a good-looking girl to like you, you may pay more attention to the behaviors that support the idea and ignore or explain the behaviors that don't.
This illusion may be the result of a combination of multiple psychological phenomena, including projection bias, egocentricity, similarity-attraction principle, and confirmation bias. It is important to consciously identify these biases and try to look at the signals in interpersonal communication from a more objective perspective. Millions of points looking for the author of the liver poster