I want to leave but he won't let me go?

I want to leave, Im done, there is nothing else to it. Its over, its been 7 years and its over. He won't let me go. everyone on here says that if your done then go. we'll im trying and he won't let me , hes guilting me into staying. Telling me that my problems aren't that big, He is kind of chauvinist. People always say leave your relationship before you meet someone else. We'll that's what im trying to do I know if I don't get the heck out of this relationship I will end up doing something stupid because i am sexually frustrated and emotionally drained. So I want to do the right thing and go before it gets crazy. He just doesn't understand were it all went wrong. It s not like we had a big fight. Its just the little stuff that eventually adds up and snowballs and im done. How do I get the point across to him that its OVER officially no turning back nothing. If I have to hurt his feelings a little to get the point across im prepared for that but no words that are coming out of my mouth are registering in his head. I feel suffocated, Life is to short to be in this marriage anymore. How do I get my point across point blank.