Try shooting 2 or 3 takeoffs and landings with your instructor and then have them get out and immediately do 2 or 3 more. Don't. Think about just go do it and you will be fine. It is not unusual to be aprehensive after a long period of no flying. Have you discussed this with your flight instructor ?, If not perhaps you should. He or she may have some helpful ideas. It's like your first solo, once you do it you will begin to relax as soon as you lift off. Good luck and happy flying.