So theres this guy...?

i like him im 12 but he's 14 we go to the smae school. and in band cl i see him looking at me. but only for a few seconds. and then on the bus he stares at me then i look at him and his eyes just sit there for like 2 seconds then they leave. what should i do?; because i cant get him out of my mind and he's just stuch there like thts all i think about(except for like whn im with friends or listening to music or homework etc.).