Please correct.

English as a Second Language English Vocabulary, Grammar and Idioms
1

I.

  1. I am feeling good.
  2. I felt good mood.
  3. I am in a good mood.
    Are they all correct? Do they mean the same?
    II.
  4. This is where you mistake.
  5. This is where you are mistaken.
    Do they mean the same?
    What is the meaning of #4?
    Please correct.
    Thanks.
2

  1. I felt in a good mood.
    They are similar thought the 2nd sentences refers to the past while the others refer to the present.

  2. There is where you are making a mistake - means 5.