The road bike position does feel VERY weird at first if you are used to a hybrid. Taht's normal. Your body will get new muscles that will make that position feel more normal over time. First, the basic frame size, and then the REACH is what is going to be a major factor concerning the fit.
Everyone told me I "looked good" fit-wise, on my new bike, when in reality the stem was too long but I wouldnt have known because I was new to road bikes and didn't know how I was SUPPOSED to feel. I felt so high up and awkward!

Whatever bike you get you need to make sure they do a good fitting and still you may need to make more parts adjustments/changes as you get used to it. I took me a couple of months for it to become obvious to me that I reallu needed a shorter stem. Then I put a TOO short stem on and it took another 4 months for me too realize that it was too short. Just put on a third stem, in between size, and the difference is obvious and dramatic- it feels really just right now. My bike which originally felt so weird and awkward and high and scary...now feels smooth and wonderful and natural to me.
If you feel good with that salesman and he is patient, then yeah I'd stick with him (though it won't hurt you to ride a few other bikes in other places too)
The more bikes you test ride, the more you will know what's right for you and what isn't. If you want a road bike, there is no reason to think you "can't" get used to riding one. If it fits right, you will quickly adapt and love it and will wonder why you ever doubted your ability to ride one.