You are
Dead
Because
I think all the sentences refer to commonly used idioms and expressions.
I am right;
Dead right - right without doubt.
I am left.
Left for dead - left in a situation where death is the most likely outcome.
I am on;
Dead on - perfectly accurate, exactly right.
I am wrong.
Dead wrong - completely wrong.
I am winter;
Dead of winter - the middle of winter.
I am heat.
Dead heat - a situation in which two or more competitors in a race are exactly level.
I am ahead;
Dead ahead - straight ahead.
I am last.
Dead last - exactly last.
I am play;
Play dead - to pretend to be dead.
I am serious.
Dead serious - completely serious.
I am wood;
Dead wood - people or things no longer useful or productive.
I am man.
Dead man - an object buried in or secured to the ground for the purpose of providing anchorage or leverage.
The Ringer
Dead ringer - an exact lookalike.
