I was a test car driver for honda for 3 years. I wish I could show you the videos of the crashes we had to watch during our monthly safety training. They were real videos from crash scenes. They were horrifying! Nothing was blurred out as they wanted us to understand the full impact of what could happen. I will never forget the sounds of the injured, screaming and crying as they were cut from some of the cars. I will never forget the visuals of seeing bodies decapitated, or body parts ripped from the persons body. Needless to say I will never speed.
You asked about the cruise control, Yes it does kick off when you step on the brake. That's what it's supposed to do. You just have to reset it when it's needed again. I really hope you take to heart everything people have said. You are young and we care about not only you but the others on the road with you.