PLEASE HELP. I accidentally hit someone with my car boyfriend texting?

OMGG today i was driving and i just learned how 2 drive and i was texting my BF and i heard this big BUMP noise and the car bumped over something. i looked in the rearview mirror and there was someone laying down on the road! i dont know if thwy were already laying down on the road or if i hit them and thats why they were laying there. well i sped outta there and im home now and im scared. can the police find me? good thing the person must be knocked out or dead so they cant remember my liscense plate and report me. im pretty sure so one saw.