I have a few questions on my 2012 Ford Focus SEL?

Ok, I recently got a 2012 Ford Focus SEL. It has 24,000 miles on it when I bought it, now it has about 26,000. Here are the questions: 1. Every time I start the car, it vibrates, then when I slowly step on the gas, I hear it vibrate a little louder. I have change and other stuff in the car, so I don't know if that's making the noise. But when I accelerate, everything's normal. So is there anything wrong with the car, or its normal? 2. I like to drive fast. I got it up to 119mph a few time on the highway. And I was wondering if that's actually bad for the car. Cause some of my friends say its good and some say its bad. (I don't really know anything about cars. I only know a little bit, so I'm still learning) Thank You Very Much For Answering!!!