Why do i keep clearing my throat?

im 16 years old and recently i've got a habit of clearing my throat almost like theres a bit of flem in my throat. It isnt a lot of flem so I cant actually bring it up and spit it out (as awful as that sounds) i didn't do it a lot but now that i've started worrying about it i do it up to several times an hour. Could this be some sort of vicious circle or something else? and should i be worrying about it?