Is it normal to be scared of flying before becoming a pilot? Are there any studies that have researched into fear of flying when not in the cockpit? The question arises from the fact that for some reason, I have found myself to be scared when on a plane as a passenger, but when at the commands the situation is totally different. This applies also to a lot of people when driving cars for example. Is this a normal human behaviour?
I think its extremely normal. The fear of the unknown is very powerful. When you are in control, you generally know what is coming and aren't surprised. 

Most pilots I know have no desire to sky dive. They love the freedom of flying, but falling uncontrolled is not enjoyable to them. 

When I'm not PIC, sudden drops give me that put in the stomach feeling. When I'm in control, that NEVER happens.