Should I say yes or wait !!

My boyfriend said we should just go down To the courtyard and get married & just have a reception after! Now I would love to get married to him and save a lot of money this way. I would've loved to get walked down the aisle and stuff but since my father died haven't been so big on walking down the aisle now. We both live with our parents he's a dental assistant and plans on going back to school for hygienist but he's not to crazy about it because he's training for lab tech right and they make about the same. I am a CNA and I'm crazy  about going to school to be a LPN which is only a year and I want to move up the ladder eventually. But he wants to start having kids in a year I'll be graduating lpn if everything goes smoothly. Now the question do u think I'm to young I'm 19 & hes 21 do u think it's to early to be getting married, getting a place and talking about babies and stuff. We lived together for a year when I turnt 18 but we didn't release and we just moved back with our parents.