No more sex

So I recently went to a youth retreat and changed a lot of my perspectives in life.

Me and my boyfriend have been dating for almost 3 years and I want to stop having sex with him until we get married. He is absolutely against it and wants to keep doing it. He says it's unfair to just switch my mind up like that. And he doesn't want to stop and change things. What should I do?

Am I bad for wanting to change?