Tieme said:
Well the frame size I think is right - I am 5'8-5'9 and it is a medium which is pretty much the consensus I have gotten from anythere I've looked.
Frame fitting is the easiest part of the bike to fit, b/c it's generally associated with height and foot size if you're in an in between height. M translates out to a 54cm-56cm range depending on the company, which is right for your height.
More extensive fitting is swapping stems for a longer/shorter reach, and more/less rise of the bars. A general rule of thumb for a recreational rider is to have two fingers of drop from the seat to the bars, and 4 fingers for a more aero position. You can also adjust the seat position forwards and backwards to taste to accommodate your pedal stroke, and a little bit of reach as well. Additionally, you can rotate the drops up or down to taste. The goal is to not feel too stretched out, and not too compact.
For seat height, although there are said exact positions of where it 'should' be, it really comes down to preference. There are a few tricks to getting the seat to about where it should be. If you have someone hold the bike for you, sit on the saddle, line up the pedal with the seat tube, and put your heel on the pedal. Your knee should be locked, but your hips should not be rocking side to side to achieve the reach. With your feet then on the pedals, you want a slight bend of the knee, and again, your hips should not be rocking on the seat while pedaling. However, with clipless pedals, different cleats act as a shim, which then requires the seat to come up a little higher. Look cleats in particular require a decent rising of the saddle.
Fitting a bike is more of a general guideline to get you close to where the bike should be, and not the end all, set it and forget it positioning. Every rider is different, and thus everyone has their own comfortable geometry.
The tough part for a new rider is they aren't used to being in drops, reaching for the hoods, and so they always feel stretched out and uncomfortable at first. Go ride your bike, see where pains show up, post them here, and people will be able to help you out. There is not a lot to change on a bike to make it fit right.
Side note: It's incredibly strange that the shop you bought the bike from didn't offer you a full fitting. At my shop, we size a customer to the frame on the spot when showing them bikes. After they've decided to purchase a bike, we then offer a full fitting, to where we adjust the seat height, seat, seat angle, bar rotation, and then also swap stems if necessary. As a rule of thumb, if a customer wants a shorter/longer stem, we'll swap it for free if it's of equal or lesser value, and they have to pay for it if it's an upgraded part. The shop you bought your bike from should have tons of stems lying around from swaps. We have at least 10 Ritchey Pro stems lying around, as most of the bikes we sell come with them stock, thus making it an easier swap for us.