What should I do? I got a promotion to my dream job as the head football coach at my alma mater and I am scared to death.
That's awesome! Congratulations. That's a big job, no wonder you are a bit scared.
The feeling of overwhelming responsibility that came to me. I'm scared I haven't what it takes.
It's normal to feel scared about a new job but you should be proud of your accomplishments. I am so happy you landed your dream job so don't let fear take over. You know deep down how good you are as a football coach.
I wish it was that easy. The fear and doubt are driving me crazy.
It's normal to  be intimidated by a new challenge. However, you should be proud that you have gained this position.