Just wanted to reiterate what everyone else has already said, and that's that your feelings are perfectly normal and natural!
When I had a 12 week mc, my best friend was 2 weeks more pregnant than me.
I had to 'go through' her pregnancy with her as her partner was so unsupportive, even went to apts with her.
Was incredibly difficult and more than once I wanted to wail about how unfair it all was.
There are no hard and fast rules about how long it takes to 'get over'. One day you'll just wake up and it won't be the first thing you think about.