There is nothing to build, no-thing to rebuild @szuri. Essentially there is no difference between the You as a child and You as you are now. The body has changed, the mind through accumulation of new concepts, day by day, has changed, your personallity (persona) has changed, your life values has changed you perceptions has changed.
You can change your name also, you can change your religion, you can change your nationallity and so on...but You remain You as always...You are aware of all this changes...this You cannot never change...this You cannot never be rebuild...this You cannot never be touched...because IS already perfect...it was, it IS, and will always be.

It's normal for the mind to want more and more, to want more information more knoeledge, to want a better person, to be always in search of something, to want to have something to improve. But You can see (be aware of) your mind, You can see how it changes, thoughts change, emotions and feeling passing by like clouds etc...You can see all this because You are not subject to change.
Be open! Be fearless and just allow Life to unfold in front of you and through you with all the feelings, emotions and energies...this is your path to You.

Just Be!...do not let your mind postpone it to "someday...".
Big hug!

P.S. The recipient of these words have to be You not your mind. Let the mind to be only the postman this time.