In many ways I really do adore this lady, she is one of the sweetest people I've ever met. And we are both about as sensitive as people can be, so we relate to each other in how we react to the world. And just to be fair, I am hardly the picture of perfect mental health. We'll see what develops, I just wish she had more confidence and wasn't so pushy, and depressive, and overbearing...
So do a relationship check up with each other so you know where you clearly stand. See if you can both agree to take things more gradually. Tell her very gently how her words and actions make you feel. If you'd like to fix those things, maybe you can if you work together on them. Tell her you don't want to think marriage at this point in your relationship, that it's too early for you.