So How Does One Know If He Is Depraved In Spirit Or Just A Sinner?

Sinning is not usually of a perverse nature, it is going against the word of the Lord. Depravity is of a perverse nature, and is usually considered by the extreme measures that one would take to do something terrible to another person or animal, like cannibalism, or rape or murder. Hope this helps.

Everyone is a sinner.

Yes, everyone sins.  That is how we learn from our mistakes.  Just make sure to repent and try not to make the same mistakes and learn from them.  Pray for forgiveness.  And make sure to make things right whenever possible.