Im being Molested...Help me Plzzz!?

Hey guys..i am 14 and i play ping pong as a sport actually..so i have this new coach..and everyday on practice he is supposed to show me new moves and stuff..he is SUPPOSED to ONLY hold my right hand to show me the move and maybe my waist just to have some control..im okay with that..but the problem is whenever he puts his hands on my waist he starts to get higher till he reaches my and he starts to touch me in a weird way and he starts squeezing :S :S...or he goes down to touch my behind and starts rubbing :S :S ewww..and all of this is between the brackets of (im ur coach and this is the way i teach) ...everytime he does it i get scared and confused and can't tell him to get away..i cant tell my parents because they'd make a huge problem ..then every single person would know that i was being molested..so today i tried to kinda push him but he kept on pulling me bak..then he sorta hugged me from the back..am im hell afraid of being d :'( and im afraid that if i told him in his face stop it he would get angry and me :( any suggestions to solve it? guys im sorry for too much details but these moves totally made me sure that he is molesting me..plz plz plz help me