Me costó admitir que necesitaba ayuda con la presentación.

Because costar is often used like to be hard for someone or to cost someone effort.

So in Me costó admitir..., me means to me / for me.

A very literal breakdown is:

• Me = to me
• costó = was difficult / cost effort
• admitir = to admit

So the sentence structure is closer to:

It was hard for me to admit...

This is very common with costar:

• Me cuesta levantarme temprano. = It’s hard for me to get up early.
• Te costó entenderlo. = It was hard for you to understand it.

Not in the money sense here.

Costar can mean:

• to cost money
  
  • Cuesta diez euros.
• to be difficult / to take effort
  • Me costó admitirlo.

In this sentence, costó means something like:

• was hard
• took effort
• was difficult

So Me costó admitir... is a very natural way to say I found it hard to admit...

Because the speaker is talking about a completed past experience.

Costó is the pretérito indefinido (simple past) of costar, third person singular.

Why third person singular? Because the thing that was difficult is the action admitir que necesitaba ayuda con la presentación.

So grammatically, the subject is not I. The subject is the whole idea of admitting that I needed help.

You can think of it like this:

• [Admitir que necesitaba ayuda] me costó.
• That was hard for me.

Because after costar, Spanish often uses an infinitive to say what was difficult.

Pattern:

• costar + infinitive

Examples:

• Me cuesta hablar en público. = It’s hard for me to speak in public.
• Nos costó encontrar la casa. = It was hard for us to find the house.

So:

• Me costó admitir... = It was hard for me to admit...

If you said admití, you would be creating a new finite verb, which would change the structure completely.

Because necesitaba is the imperfect, which is often used for:

• background information
• ongoing states in the past
• situations that were true at that time

Here, necesitaba ayuda describes the speaker’s situation at the time: they needed help.

So:

• Me costó admitir que necesitaba ayuda... = It was hard for me to admit that I needed help.

Using necesité would sound more like a specific completed event: I needed help at one particular moment, which is less natural here.

The contrast is:

• costó = the act of admitting is viewed as a completed event
• necesitaba = the need is background/state information

Yes. Both con la presentación and para la presentación are possible, but they are slightly different.

• con la presentación = help with the presentation
• para la presentación = help for the presentation

In most cases, con la presentación is the more direct and natural choice if you mean help dealing with the presentation itself.

Examples:

• Necesito ayuda con los deberes. = I need help with the homework.
• Necesito ayuda para el examen. = I need help for the exam / to prepare for the exam.

So con la presentación strongly suggests help in doing or preparing the presentation.

Spanish uses the definite article more often than English does.

Here, la presentación refers to a specific presentation already known from context, so Spanish naturally includes the article.

English often says:

• with the presentation
• or sometimes just with my presentation, depending on context

In Spanish, leaving out the article here would usually sound incomplete or unnatural:

• con presentación ❌

So con la presentación is the normal form.

It is understandable, but it sounds less natural.

More natural options are:

• Me costó admitir...
• Me resultó difícil admitir...
• Fue difícil para mí admitir...

Me costó admitir... is especially common and idiomatic.

Tuve dificultad en admitir... feels more formal, less conversational, and less typical in everyday Spanish.

Because me already expresses to me / for me, so adding a mí is usually unnecessary unless you want emphasis or contrast.

Normal:

• Me costó admitirlo.

Emphatic:

• A mí me costó admitirlo, pero a ella no.

So in your sentence, just me is the most natural option.

Both can work, but they are not always identical.

• admitir = to admit
• reconocer = to acknowledge / admit / recognise

In this sentence, admitir is very natural because it suggests accepting something that may be emotionally difficult.

Reconocer is also possible:

• Me costó reconocer que necesitaba ayuda con la presentación.

That can sound slightly more like to acknowledge or to admit to myself/others. The difference is small here, and both are good.

The structure is:

• Me = indirect object pronoun
• costó = main verb
• admitir = infinitive
• que necesitaba ayuda con la presentación = subordinate clause explaining what was admitted

So:

Me costó + admitir + que...

A useful way to see it is:

• It was hard for me
  • to admit
    • that I needed help with the presentation

Spanish word order here is very normal and natural.

Yes, but the original is the most natural in neutral speech.

Possible alternatives:

• Admitir que necesitaba ayuda con la presentación me costó.
• Me costó mucho admitir que necesitaba ayuda con la presentación.
• Fue difícil para mí admitir que necesitaba ayuda con la presentación.

The first one is grammatical, but it sounds more marked or literary because the infinitive phrase is moved to the front.

The original version is the most common everyday order.

It would be:

Me cuesta admitir que necesito ayuda con la presentación.

Changes:

• costó → cuesta = it is hard for me
• necesitaba → necesito = I need

So:

• Me costó admitir... = It was hard for me to admit...
• Me cuesta admitir... = It is hard for me to admit...

It works perfectly in Spain Spanish, but it is also natural in most Spanish-speaking regions.

Nothing in the sentence is strongly region-specific. A speaker from Spain or Latin America would generally understand and use it naturally.

The only thing to remember is that la presentación could refer to:

• a school/class presentation
• a work presentation
• a formal talk

And that is true across the Spanish-speaking world.