how should I understand the sentence I am frustrated to do something

Question

my confusion stems from the sentence structure

I  am happy to do something

I am not sure but for now I consider this is the same structure as mentioned in the title and in such way I interpret it.

However，there are also sentences in passive voice holding the same pattern (i presume they are the same)like I was told to do something / the message was spread worldwide to inform everyone.

this is why I want to know how native speakers see this sentence

either

• I feel frustrated about doing something

or

• I am frustrated for the purpose of doing something / for someone to do something

or something other than these two

Answer 1

Some adjectives (including past participles) can be followed by to-infinitives. BBClearnEnglish explains:

Sometimes the to-infinitive gives a reason for the adjective:

• amazed, delighted, disappointed, glad, happy, etc.

1. We were happy to come to the end of our journey.
   (= We were happy because we had come to the end of our journey.)
2. John was surprised to see me.
   (= He was surprised because he saw me.)

So your sentence

I am frustrated to do something

means I am frustrated because I have to do something.