in my opinion you never really get over that feeling you just get better at riding and the feeling shifts itself to harder stuff, for instance when I started I was afraid of drops, now I have the ability to do them well so the thought never pops into my head but when I go for new dirt jumps on my mtb I get that feeling cause I am not use to them even though I ride very similar stuff with ease when it is in the middle of a track. As everyone else said it just comes down to confidence and practice