stop being delusional and learn smth about bodylanguage. i know when a girl has interest and when not. casually looking would be:
pass me on a street, look at me, look away, thats it.
interested looking but shy: look at me, look to the side/ground quick, look again after a few seconds and repeat
interested looking and confident: stare at me with wide open eyes, dont look anywhere else, smile, turn head even (this happened like 5x in total to me its more rare than shy girls)