Crecerse

[ROBINDESBOIS]

How can we say crecerse in the following context?

I don't like speaking in public but when I ´m forced to do it the second meaning against the wall I crezco myself and I can't stop talking.

[poli]

How can we say crecerse in the following context?

I don't like speaking in public but when I ´m forced to do it the second meaning against the wall I crezco myself and I can't stop talking.
...but when I forced to do it, I get bold and can't stop talking.

[Rusty]

... but when I'm forced to do it, I ...
step up (rise) to the challenge ...
muster up the courage ...
step forward ...
stand up ...