What does "I feel like a fool" mean?

1. I look like a fool to people (might not include myself), or I seem like a fool to people. (objectively)

2. Personally, I feel or I think that I am a fool.

HI! I know this question might be a question of fool itself, but I still don't get something across from this sentence. Please help me out. :)

Thank you!

Question

What does "I feel like a fool" mean?

1. I look like a fool to people (might not include myself), or I seem like a fool to people. (objectively)

2. Personally, I feel or I think that I am a fool.

HI! I know this question might be a question of fool itself, but I still don't get something across from this sentence. Please help me out.  :)

Thank you!

Answer

I look like a fool to people (might not include myself), or I seem like a fool to people. (objectively)
This means that the person is conscious of the fact that  other people don't treat him/her as an intelligent person.

2. Personally, I feel or I think that I am a fool.[ means that the person knows that he/she is not intelligent]

Answer

It's the feeling you have when you realise you have done something stupid.