Will It Work?

Im 17 as of now. And my boyfriend (who i`ve been with for a year and 5 months now) have been talking about getting married.
We both live in different state because he had moved 2 weeks into our relationship. So it has been extremely hard for us. We airnt using marraige as a way to be together again. We just want to be together forever. We airnt really first loves. But its the most intense for both of us.
I havent been faithful much during this gap of time we havent seen eachother. Which frankly isnt mature.
But its hard. And im working on it.
Do you think this will work? he is everything i want.
We might not have an amazing middleclass future but it doesnt really matter to me. As long as im happy with him.
Im going there for christmas and i have a feeling he might bust the question then.
I want to atleast wait until im 21 to get married.
And im a month older than him.