Ammetto il mio errore.

Ammetto is the first-person singular present indicative of the verb ammettere.

So:

• io ammetto = I admit

Italian often drops the subject pronoun, so ammetto by itself already means I admit.

Italian is a pro-drop language, which means subject pronouns are often omitted when the verb ending already makes the subject clear.

Because ammetto can only mean I admit, io is not necessary.

You can still say Io ammetto il mio errore, but that usually adds emphasis, for example:

• Io ammetto il mio errore, ma lui no. = I admit my mistake, but he doesn’t.

In Italian, possessive adjectives like mio, tuo, suo, etc. usually take a definite article.

So:

• il mio errore = my mistake
• la mia casa = my house
• i miei amici = my friends

This is one of the big differences from English. English says my mistake with no article, but Italian normally says the my mistake, literally speaking.

A common exception is with many singular family members:

• mia madre
• mio fratello

But errore is not in that exception group, so il mio errore is correct.

The noun errore is:

• masculine
• singular

For most masculine singular nouns, the definite article is il.

So:

• il libro
• il problema
• il mio errore

You use lo before certain sound patterns, such as z, s + consonant, gn, ps, and a few others:

• lo studente
• lo zaino

You would use un only if you meant a mistake rather than the/my mistake:

• ammetto un errore = I admit a mistake
• ammetto il mio errore = I admit my mistake

Yes. Errore is a masculine singular noun.

That is why the phrase is:

• il mio errore

Its plural is:

• gli errori = the mistakes

Examples:

• Riconosco il mio errore.
• Ammetto i miei errori.

Possessive adjectives in Italian agree with the noun possessed, not with the owner.

The noun here is errore, which is masculine singular, so you use:

• mio

Compare:

• il mio errore = masculine singular
• la mia idea = feminine singular
• i miei errori = masculine plural
• le mie idee = feminine plural

So mio matches errore, not the speaker.

Yes, but Ammetto il mio errore is the most neutral and natural order.

Italian word order is often flexible for emphasis. For example:

• Il mio errore lo ammetto. = more emphatic, something like My mistake, I do admit it.
• Io ammetto il mio errore. = emphasis on I

Still, for a simple everyday statement, Ammetto il mio errore is the best choice.

Here, ammettere takes a direct object, so no preposition is needed.

That is why you say:

• Ammetto il mio errore

Not:

• Ammetto di il mio errore
• Ammetto a il mio errore

A few correct patterns are:

• ammettere qualcosa = to admit something
• ammettere di + infinitive = to admit doing something

Examples:

• Ammetto il mio errore.
• Ammetto di aver sbagliato. = I admit having made a mistake.

Sometimes, yes, depending on context.

The Italian present tense can cover both:

• I admit
• I am admitting

In many cases, English chooses between simple present and present progressive, but Italian often just uses the present:

• Ammetto il mio errore.

Context tells you whether it is a general statement, a current action, or an immediate admission.

The infinitive is ammettere.

It is spelled with:

• mm
• tt

These double consonants are part of the standard spelling and pronunciation of the verb. In Italian, double consonants matter and can affect pronunciation.

Related forms:

• ammetto = I admit
• ammetti = you admit
• ammette = he/she admits
• ammettiamo = we admit
• ammettono = they admit

So it is important to keep the spelling ammettere, not amettere.

Yes, in many situations you could, but the nuance is slightly different.

• Ammetto il mio errore = I admit my mistake
• Riconosco il mio errore = I acknowledge/recognize my mistake

Ammettere often sounds like openly admitting something, sometimes after resistance or in response to a situation. Riconoscere can sound a bit more like acknowledging or recognizing that something is true.

Both can work, but ammetto is a very natural choice for I admit my mistake.