Break up or..?

Okay, so we will be dating a year sept 13, but I don't know of I want to date him still.. He's turning 18 and I'll be 15, I'm worried about that. He's to clingy, he constantly has to be touching me or holding my hand, he's to in love with me.. I don't know what to do. He said if I break up with him he'll change in a negative way. And I would not want the blame for that..