It's natural to have such feelings... The fear of succeeding is always there when you are about to start something new. Most people tend to give up because of this fear. I want to tell you that you shouldn't be like this people. Life is all about risk, and without risk, there isn't a way you can make headway....
So, let go of the fear and do your thing. Just be optimistic and it will surely work out just fine.... I wish you all the best.