Sounds like you're frustrated!
I'm not familiar with your situation but, here's a few possiblities...
Sounds like she might be a lesbian ? Just a possibility...
Or perhaps they forgot to "arrange" her sex education...
Or perhaps she's not in love with you but is saving herself for her first love? Maybe she felt she had to go thru with the wedding but did not want to or perhaps she felt rushed by it all, and pressured to do so...or does not like sex?
does she have any brothers? Did she grow up seeing penises or not?
Is yours the first one she's seen hard?
Maybe she thinks penises are ugly?
or is she from an "all girls" family?
Perhaps she's never seen a big one before? or a hard one...
What if she thought they all came in mini sizes and is shocked yours
is so big? Maybe she's afraid she'll get hurt?
Maybe she just needs time, and perhaps communication might help?
Is she attracted to you?
Perhaps you could find a way to be friends before you become lovers?
Perhaps she does not want kids, or prefers to wait.
Perhaps she just needs to feel more relaxed to enjoy it?
Maybe she needs a lot more foreplay than you do to get started...
You might want to talk together, perhaps she has questions that need to
be answered, but is too shy to ask...yet.
Good luck.