well (sexual motion on flat surfaces r like humping floors or walls )and he says that he wasnt just ready for a girlfriend yet what does that mean

i have a crush on a guy in my 3rd and 4th period classes and i want to know if he likes me. he laughs at all my jokes , when my friends talk about me to him he smiles , and he does sexual motions to flat surfaces when im around . does he like me or is it pretty much normal(we r 13)?