Everything and nothing at the same time

I am not this, 

And I am not that, 

I am clever,

And I am foolish,

I remember events that happened years ago,

And forget what happened yesterday,

I like to be with people,

And I like solitude,

I like to spend,

And I like to save,

I like nature,

And I like tall buildings,

I know some advance stuff,

And I don't know the basics,

I want to live,

And I want to know death,

I am very strong,

And I am very weak,

I am everything, 

And I am nothing