Too young??

Is this too young? I just turned 19, and my boyfriend is 21 and we are planning to have a child. We are also wanting to be engaged. Me and him plan to get an apartment in about 6 months and even though he has a great job and we could afford it now, we plan to wait to have more money. We haven't been together very long.  But we do plan on getting engaged and trying to a baby. I was also a person who said they would never been married or have kids. Even though I have had relationships as long as four years. 
Also, what's the soonest you found out you was in love??