The innocence of your youth will always be with you. It hasn't been lost or eroded.
You're being faced with a choice. Either you allow nervousness and fear to hold you back and prevent you from moving forward, or you step step forward bravely into the unknown future. Take a step out of your comfort zone and investigate further. By doing something out of the ordinary every now and then, you'll build your courage and your capacity to face new challenges.
Don't try to force your career to progress. Be smart about how you play the career game and look for opportunities to exploit.