Cold feet

I'm almost at the tail end of wedding planning and something familiar is starting to rear its ugly head...anxiety!!
The feeling of wanting to give up or run away is niggling away at me when it should be one of the happiest times of my life.
I'm excited about the big day, but starting to feel afraid of myself. Does anyone know what I mean or have any advice on how to calm down and enjoy this time?
Marrying my best friend is exactly what I want to do. I think just get scared of what feels like an enormous next stage of life and I'm full of mixed emotions. This makes me anxious and that leads me to my depression and wanting to give up when things just feel like too much to handle.
And then there's the guilt...
I get scared I'll never be able to "handle" anything as I always tend to crumble.
My husband to be is so strong, must be why we found each other.
Maybe one day I'll have some faith in myself. Hopefully that day is soon!!

Thanks for listening, don't really have anyone I could say these things to!