Today we are professionals, I was not what you dreamed of

Firstly, i like the way you went about in your letter addressing your younger self as we and acknowledging that she is an important part of you.
I also can relate to the fact that not all dreams as kids were fulfilled, we tried but it's how life is.

I want you to know that you have always been and will continue to be happy, since happiness is within us

Every kid needs a boost, and this phrase of yours is a big boost to your younger version's confidence.

Good luck with this entry post, it is amazing.