I dont know what to do. Help?

a • .
Ive been with this guy for 6 months now and i completely fallen for him, i do want to spend the rest of my life with him but theres a problem he has a kid from a previously realtionship. Im 21 he just turned 26, i always wanted a family of my own with someone just me and them, i told myself i would never date a guy with a kid but there was something about him i just couldn't let him go. We recently got engaged and im very old fashion and i dont want to always have a reminder of him being with another women, if i even mention an ex of mine he flips, but he has no idea what im going thru i really want to be with him but idk because him having a kid really bothers me.