Advice!!! PLEASE HELP its about getting married!!!! URGENT?

Im 15, and i have been dating this guy for 3 months! Hes so amazing. We have everything in common, we even finish eachother sentences. He says im the one and that we will make it. I live in Littleton CO and he lives in Highlands ranch CO. So its a 20 minute drive. We seeeachtoher every saturday. Its hard not seeing him all the time, but its worth it to see his face at the end of the week(: I know were young, but i want to get married at 18. And so does he. So we have planned, our wedding, how were going to live, were, money, and alot other things. I want to get married young, because i want to make my future with my husband, and grow from there. I know not alot of marriages dont last that young, but i dont believen divorce. And nither does he. Another thing about him is he is very old school. He wants to save "IT" til marriage. If you know what i mean. And he believes that the wife stays home and takes care of the kids while the husband works. Hes so sweet and amazing. What do you think? My mom says 18 is to young. But its my life and what i want. When im with him its so perfect, it feels right. Its like im HOME(: