Can you post a picture of you actually riding the bike, taken from the side? I bet you were gripping your bars for dear life, elbows straight, shoulders up to your ears. That's not surprising since you're a new rider on a new bike with new features, but it's not a habit you'll want to develop.

Relax your shoulders, bend your elbows, and be light on your hands. In order to do this, you'll need to use your core to hold you up. If you don't already have a strong core, you may want to consider adding some strengthening exercises (like Pilates) to your routine.

Congrats on the bike!