lice fucking problem

so when the hairdresser was cutting my hair, i saw a fucking lice then when i was showering i saw like 3 from my towel .... I HATE LICE,,,, ITS LIKE THE FIRST TIME I SAW LICE IN MY OWN HAIR IN 10 YEARS idk where i got it but i think its from a classmate :// im really close w her maybe its when i put my head on her shoulder thats where the lice go on mine.... i saw like little lices on her hair but not the mother (??) lice but what i saw on my hair is the mother lice or big lice or wtv its called im freaking out cuz its so disgusting HOW DO I GET RID OF IT IMA KMS how do i get rid of it without buying products,,, cuz im broek