Help, I need some advice! My boyfriend and I are living together and are not married...?

I messed up with this relationship and need some advice on what to do to fix the situation! My boyfriend and I met about a year ago. We got along great and he was always at my place or I was at his, so I said it would be ok if he moved in. I was the one who suggested it, and he was ok with it too. I feel like things are going well. We both don't have any baggage...never been married before, don't have kids, both work really hard. He is 25 and I am 26. I am so close to his family, they ALWAY hint that we get married...he just smiles and has always been very shy. I do want to get married, however he is really shy about the idea of it all. He does want to get married, but uses the excuse of 'it's just paperwork"... I am worried because we did things a backwards it won't work out. Why buy the cow when you get the milk for free. I have hinted towards getting married and he isn't opposed to it, but he doesn't like to talk about it and almost gets annoyed and I feel like i'm pestering him. He said things are great now, lets just give it some more time and keep it the way it is. I feel he's right...I want to be with someone at least a year and a half before making the decision to marry someone. My mom says I should know him enough by now to know if he's who I want to marry, but now we just have to see if we can keep it this way for awhile and if it works at that time, then he'd be a good man to marry. I am just worried that he is enjoying all the things of marriage without commiting. It makes me sad. Is it ok for me to ask him bluntly, if things are still going this well by next year, would you want to get married? If not, should I leave...or any other suggestions. His opinion is if it's not broke don't fix it. But to me it is broke because it's not how I was raised! Thanks for your opinion!