I have a bigg crush on a guy I love him since 1 year and I dont know whether he likes me or not ? I

I really love a guy alot though I'm only 15 bit I know its not infatuation coz its been 1 year since I love him, though I know he does'nt he is my best friend's cousin we talked a few days before through my friend and I dont know whether he likes me or not i really Love him alottt! What should I do??