Estoy avergonzado.

Because avergonzado describes a temporary emotional state, not a permanent characteristic.

• Estoy avergonzado = I am embarrassed / ashamed right now
• Soy avergonzado would suggest something more like I am a शर्मful/embarrassed-type person, which is not the normal way to express this idea.

In Spanish, estar is commonly used for feelings and states:

• Estoy cansado = I’m tired
• Estoy nervioso = I’m nervous
• Estoy avergonzado = I’m embarrassed / ashamed

Avergonzado usually means embarrassed or ashamed, depending on context.

It can cover both:

• feeling awkward or embarrassed in a situation
• feeling ashamed about something you did

Examples:

• Estoy avergonzado por lo que dije. = I’m ashamed of what I said.
• Estoy avergonzado delante de todos. = I’m embarrassed in front of everyone.

So the exact English translation depends on the situation.

Because Spanish often leaves out subject pronouns when the verb already makes the subject clear.

• Estoy avergonzado already means I am embarrassed
• The ending -oy in estoy tells you it is yo

You could say:

• Yo estoy avergonzado

But that usually adds emphasis, contrast, or clarity:

• Yo estoy avergonzado, pero él no. = I’m embarrassed, but he isn’t.

Yes. Avergonzado is an adjective, and it must agree in gender and number with the person it describes.

• A man would say: Estoy avergonzado
• A woman would say: Estoy avergonzada

Plural:

• Estamos avergonzados = We are embarrassed (all male or mixed group)
• Estamos avergonzadas = We are embarrassed (all female group)

A helpful approximate pronunciation is:

es-TOY a-ber-gon-THA-do in much of Spain
or es-TOY a-ber-gon-SA-do in Latin America and some parts of Spain

A few pronunciation notes:

• Estoy: stress on toy
• v in Spanish sounds very close to b
• z in most of Spain sounds like the th in think
• z in Latin American Spanish sounds like s

So in standard Spain Spanish, avergonzado often sounds roughly like a-ber-gon-THA-do.

No, they are related but not the same.

• avergonzado = embarrassed / ashamed
  
  • describes how a person feels
• vergonzoso = shameful / embarrassing
  
  • usually describes something that causes shame or embarrassment

Compare:

• Estoy avergonzado. = I’m embarrassed.
• Es vergonzoso. = It’s shameful / embarrassing.

This is a very common distinction for learners.

Yes. On its own, Estoy avergonzado can mean either one.

Context tells you which is more natural:

• If someone made a social mistake, it may mean I’m embarrassed
• If someone feels bad about wrongdoing, it may mean I’m ashamed

If needed, Spanish can be made more specific:

• Estoy avergonzado por mi error. = I’m ashamed of my mistake.
• Me da vergüenza. = I feel embarrassed / It embarrasses me.

Yes, they would say it, and it is correct. But in everyday conversation, people in Spain often also use other expressions, especially:

• Me da vergüenza. = It embarrasses me / I feel embarrassed
• Me siento avergonzado. = I feel embarrassed/ashamed
• Qué vergüenza. = How embarrassing / This is so embarrassing

So Estoy avergonzado is natural, but depending on context, a Spaniard might more often say something like Me da vergüenza in casual speech.

Both are possible, but they are used a bit differently.

• Estoy avergonzado focuses on your state:
  I am embarrassed / ashamed
• Tengo vergüenza means literally I have shame/embarrassment, and often sounds like:
  I’m embarrassed, I feel shy, or I’m too embarrassed

Examples:

• Estoy avergonzado por lo que hice. = I’m ashamed of what I did.
• Tengo vergüenza de hablar en público. = I’m embarrassed / shy about speaking in public.

So tengo vergüenza can sometimes overlap with I’m shy/too embarrassed, while estoy avergonzado often sounds more directly like an emotional state.

No — be careful! That is a famous false friend.

• Estoy avergonzado = I’m embarrassed / ashamed
• Estoy embarazada = I’m pregnant

Also note:

• embarazado is used for a male who is metaphorically or unusually described as embarrassed/encumbered in some contexts, but for learners this word is dangerous because embarazada very commonly means pregnant

So if you want embarrassed, use:

• avergonzado / avergonzada
• or expressions with vergüenza

In this sentence, it works as an adjective.

The structure is:

• estoy = I am
• avergonzado = embarrassed / ashamed

So the sentence literally works like:

• I am embarrassed

The related verb is avergonzar = to embarrass / to shame

For example:

• Eso me avergüenza. = That embarrasses me / shames me.

But in Estoy avergonzado, the word avergonzado is describing your state, so it functions as an adjective.

You could, but it does not usually mean the same thing in normal conversation.

• Estoy avergonzado = I’m embarrassed / ashamed
• Me avergüenzo = I am ashamed (often in a stronger, more deliberate sense), or I feel ashamed

Me avergüenzo comes from the pronominal verb avergonzarse and can sound a bit more formal or literary depending on context.

Examples:

• Me avergüenzo de mi comportamiento. = I am ashamed of my behaviour.
• Estoy avergonzado por mi comportamiento. = I’m ashamed / embarrassed about my behaviour.

Both are possible, but Estoy avergonzado is often the simpler and more neutral option.

Not necessarily. Estoy avergonzado is already a complete sentence.

But if you want to say what you are embarrassed or ashamed about, you often add:

• por = because of / about
• sometimes de in other related expressions

Examples:

• Estoy avergonzado por lo que hice. = I’m ashamed of what I did.
• Estoy avergonzado por mi error. = I’m embarrassed/ashamed about my mistake.

So the basic sentence is complete on its own, but por is common when you add the reason.