how do i end thisss

basically, i met a guy, after two months we hung out, it went badly. i never really wanted him, i was just excited about the idea of being someones crush, and mostly, i didnt want to miss the chance, cause you know i dont get hit on very oftenly. anyway, i didnt feel any chemistry between us, and i just want him to walk away, but he doesnt read minds. and i dont really know how to tell him that. i dont know if its better to say it in person or by text, and im scared it will get a weird vibe in class. and i just hate these type of situations, where you do have the solution of the problem - clarifying  things with him - but you cant resolve the problem right now. i mean, its 23h46, and i cant just text him like ´hey, heres the thing`. i have to wait untill tomorrow morning to see how things are gonna go, and i hate that. im trying to distract myself by watching physiculturism videos on youtube,but i know ill get a little struggle to sleep tonight.