What am I? Am I just lost?

I feel.. really hopeless, useless, pointless, ineffective.
(Having a really really negative mindset at the point of writing.)

I don't know what am I anymore.
A friend of mine told me on Whatsapp, "You are a good friend."

To be honest, I have never felt that way towards anyone.
I feel like a lousy friend - sure I may seem like I care, sure I could help.
But I don't know, my heart doesn't feel that way.

Every time someone wants accompany, I could accompany but in actual fact my heart says otherwise. It tells me to be alone.

It doesn't seem like I have helped anyone to a great extent lately or in the past.

I skip meals, thinking that:
mental > food,
food is a waste of time,
and it's like that ever since.

Another friend asked me to define 'talent'.
I told him "Talent is the ability to complete a specific task without much effort and with effort it will go soaring."

Is it not right?

If so, I don't seem to possess that at all where I thought before I was good in programming.

I can't even do simple programming now, so do I really have talent?

Now I am stuck in this last 4 questions of Mathematics Homework Assignment.
I was so eager to complete them all and getting stuck for 4 hours is just unacceptable.
Therefore, I cried inside (which I always do) with all the emotions bewildering me.

Comes to the question of what am I good at, at all?

Maybe, I am so good in negativity that people don't really look up to me.
I suck at human relations, I suck at academics, really just what am I?