it is totally natural......you just got your license......with more experience and learning to trust your car..as it continues to stop when you put on the brake...and it will stop every time IF you give it enough distance to stop.....the feeling will subside. it may help you to go to a parking lot and practice braking over and over so you can learn to judge distances, get that feeling taken care of, learn the pressure of your brake, go fast and press as hard as you can for quick emergency stops and such. it is a scary thing driving a big hunk of metal and not being able to stop in time. you need to learn to master it.