Is it too soon to be thinking about marriage and having a family?

My boyfriend and I have been dating for almost 6 months, and he turned 18 in January and I'll turn 18 in December. Even though we've only been dating for a couple months we can just tell that we're gonna get married and have kids some day. However, that won't be until I'm out of college considering he graduated this year and is completing EMT school then proceeding into the fire academy to become a firefighter. Is it too soon to be thinking about this considering I'm just now entering my senior year even though we plan on waiting?