Road bike/MTB fitting issues

[Swthrtsuzy]

Hello, new here but been lurking for a little while. Saw that everyone seems to be really friendly and helpful, so I thought that I would post my issue and see if I could get any advice.

My problem is this: I've been mtbing for about 2 months now. I have a 15" Specialized Myka HT that I love the heck out of, and I always thought that it was super comfy for me. Well, when the cycling bug bit me, it got me good, and I just went out and bought a Specialized Sirrus Sport quasi road bike to ride around during the week since I don't get to go to the trails more than about once a week. The Sirrus is roughly the same size as the Myka, even taking into consideration the difference in geometry, and I've been riding it a little bit more lately. Anyway, I hopped on the Myka today to ride to class and it felt awful and tiny and like I was squished up and bending in half. Anyway, the question is this: Is this normal and I just need to adjust to the difference in a road bike vs. mtb? Or Should I make some adjustments like raising the seat on the mtb? I don't want to mess with the road bike because it was professionally fitted, but is there something I can do to the mtb?

Sorry for being so wordy. Any responses will be greatly appreciated. Thanks!

[indigoiis]

Were you fitted to the mountain bike?
How tall are you? 15" seems like a small size.

[Swthrtsuzy]

I was fitted for the mtb, actually. I'm about 5'7" but I have weird issues with torso to leg ratio and so the smaller bike was much better than the 17" they originally had me on.