Guys how would i tell him he is going to far with the touching?

ok i have a friend that is not so attractive an he kinda goes a little to far wit the touching like yesterday he touched me in the lower front area. i didn't wanna be mean so i just stood up an walked away.today he was holding my hand an AGAIN i didn't wanna be mean so i just held his hand until i could escape.and he is in the 11th grade and im only in 9th so im not as experienced as him. how do i tell him he is gong a little to far.