I hate SQL

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I hate SQL. I'm trying NoSQL databases now because I don't wanna reinvent
the weel but companies are in fact doing so. Facebook has Unicorn DB
and RocksDB. Google has its own databases too. SQL is dead for huge services
because there is always a faster way that makes things simpler and cheaper
even if they have to pay programmers to write an entire DB library.

Nobody tries to improve because everyone just learn SQL and PHP and want
something that just work. They can't see that it is just not good enough.

I tried Berkeley DB (old well-stablished key-value database written in C).
Now I need something that can store a hierarchy such as
[company]/users/[user]/[items]
Some say that it is possible to store such hierarchy in a key-value
database in a hackerish way by marshalling the key. The problem is that
the absolute path will be written multiple times in similar ways.
I need a navigational database, something like a file system, capable
of storing binary data on disk, each path node is written just once and
can be followed easily.

I want a library written in C, without any interpreted language
like SQL or JSON or Redis language, just plain API. I want something so fast that I could
run it on an Arduino or build a system as large as Facebook. Will
I have to write it myself too? Are there free software alternatives?