Being scared is good. It means you are taking this seriously. I'm very happy for you that you have found someone who you match with.
Even though you are a fair bit younger than me, a couple of things that I tell myself I think apply. - If this doesn't "work" you'll be fine - Her opinion of you or how she treats you is no reflection on you - whether good or bad - Have your own life and appreciate how she adds to the joy you already have inside yourself.
For me - "the words" are the point of no return. It embodies and implies a promise. Trusting your heart to the hands of another is difficult when that heart has been bruised and broken.
For B and I the first time we each told the other, it was done in a deliberate fashion on different occasions. Not everyone does that so if you know where your heart is and the words just happen to be spoken it's only putting words around something that already exists. Like pointing out the window and saying "horse" to alert the universe that a horse does indeed exist
On BD H52, W50 T27, M26 S21, D23 BD-9-Mar-16 D-15-Jan-18 Final-19-Apr-18 I am a storyteller. The story may do you no good. But a story is never for the listener. It is always for the one who tells