Engagement

I've been with my boyfriend for 11 months. It sounds so cliché but he has changed me for the better. I know without a doubt that he is the one I want to wake up beside every morning for the rest of my life. I've been through a lot, and I'm young. My boyfriend wants to ask me to marry him... What should I say? I don't want to get married right away, it will be after or during college. Just engagement.