I think I'm in love with someone from the internet?

I met my fiance online and iv never known any guy to be better, so not all guys online are bad. But you are kinda too young to talk to guys online tho. But if you want to tell him how old you really are just tell him the truth. You could ask him if he would be mad if you were actually a little younger than what you said before you told him but still tell him.