What am i

I can smile wickedly for Africa;

I can be very optimistic and practical;

Sometimes logical and sarcastical;

I am so confusing so mathematical;

I reverb your utterance like an hall;

Because I need to learn, yet they make me stumble and fall;

Am unable to rise fast, so I decided to crawl;

So close is the distance of my head to the floor;

What am I ????