It’s better to be average than under average. Even if you have to work 1-2 years for it.
You’re starting with decent girth, with at least 5.5” you’ll be above average in girth witch counts most.
Anyway, your mindset is very wrong and it’s probably best that you don’t do PE or else you’ll only injure yourself.
I wouldn’t do anything foolish thinking it would speed things up or anything like that. I was just hopping to be above average one day.