I think what you are experiencing is perfectly normal. Dont forget that your brain still hasn't come to terms with what you doing yet!
The whole thing about skydiving is that its a mind game.
Trust in your training, equipment and the instructors, who would not let you get into trouble, in or out the plane.
The trick is to enjoy all moments of it. I get very nervous on the ride to altitude but when the door opens!..........oh yes. Good luck. you will be ok.