How Will I Measure Up As An (Old) New Teacher?

As I am just re-starting this journey of becoming a licensed teacher, I wonder how I'll do. I've been working with children for the past 16 years,  yet it seems that actual teaching will be so different from this experience. To top it all off, I won't be a fresh out of college young teacher with all the energy that comes with it... Instead, I will be a 36 year old student teacher (assuming all goes exactly as planned) with a teenager and a preschooler at home, less the new and excited energy of the young college students, when the time comes for me to enter the classroom. 

I know that I am certainly not alone, as seen in my classes here at Trinity. It is just kinda scary and I am probably just over thinking everything. I just needed to get that off my chest...Thanks for reading!