Your error has now been revealed. You have chosen the bike based on componentry, rather than fit (which I suppose is a little better than basing a choice on colour). Componentry often can be upgraded by a competent bike shop. Men's frames are always going to be different in toptube length and that is probably the most critical issue for you. Fit, assuming you are a "normally" dimensioned women, will now be somewhat more of a compromise that the bike shop really won't be able to fix.

I somehow have this niggling feeling that you won't be happy with the outcome. You might be when you leave the shop (and I now say "might" advisedly), but a couple of rides in when your back and shoulders and arms and hands are all sore might tell a different story because you are leaning too far forward or some other fit issue.

And the saddle? Don't expect the stock saddle on the delivered bike to be the right one. If you have been riding previously on one that suits you, for sure change it over (even if it might look a bit daggy on a new bike). But be prepared to experiment with saddles.

A bike for someone who wants to ride often (as opposed to the summer weekend occasional rider) is a significant investment in time and money, as much after the purchase as prior.

Good luck. Keep us posted. While you might not see yourself as assertive, you sure can bite when provoked, so I think we can expect as honest appraisal.