A very uncomfortable situation

Sarah

Okay this is going to sound very little kiddish but I’m 17 and I don’t know what to do. A guy called me over when we were in class and he was sitting down and he asked me to help him with something and I was like “okay yeah sure I’ll help you.” I was standing up while he was sitting down and he started rubbing the back of my legs and going up higher and higher and so I stopped him and said no but he kept doing it and so I left and went back to where I was. I don’t know what to call it or what I should do. Should I just forget about it or should I tell someone? And I know I’m almost an “adult” but I just really don’t know what to do in this situation, it made me very uncomfortable and he didn’t stop even after I said no. Any comments would be helpful.