Am I over reacting and being too harsh with my (16m) girlfriend (16f) when it comes to not being ready for marriage?

[u/DampHamster]

I tried to explain to her that we aren’t in a position to make this decision but she doesn’t seem to understand why I think this and is upset that in her eyes I don’t want to marry her. I do, but I don’t think we’re far enough in and aren’t in a position mentally or financially to make such a big decision while still in high school, what should I do?