Sounds like that model would be fine for what you want to do.

No need to feel stupid- you relied on a bike shop, and they gave you bad advice, just to sell what they needed to move- SHAME ON THEM!

I wouldn't deal with that shop any more- they can't be trusted. That is why I cringe when I see people on here recommending that people only deal with an LBS; or telling people to get a fitting, etc. Between the number of incompetent bike shop personnel, and the downright crooks and liars, you're often no better off than if you did a little research yourself. Never rely on a salesman for anything, because with most of 'em, their primary objective is to sell you something...at any cost.

There was a thread on another forum- this woman paid c $2500 for a custom titanium bike.....and it turns out the shop sold her a bike which they built on a frame that was SO ridiculously small, it was like something a clown would ride! It had I think something like 9 inches of spacers under the handlebars!!!! -and this from a shop that had been in business for something like 40 years. Many bike salespeople seem to have a lot in common with used car salespeople! [Well...some used-car salespeople- I used to sell cars...but not like THAT! )

Did you test ride this bike before you bought it? Always take a good long test ride. The best fitting and best advice in the world is meaningless....how the bike feels under your chooch, that is what matters. If you stick with this model, try a 56cm, I think it'll work for you. Also try and ride a 54 and a 58, just to see how they feel- as some people like a bigger bike...some smaller- I don't think you'd want smaller than a 56cm though...and with shoes, your nads might even clear the top tube