jǐnguǎn wǒ hěn jǐnzhāng, háishi zuò le zìwǒjièshào.

It means something like although... still... or despite... still....

So:

• 尽管我很紧张 = Although I was nervous
• 还是做了自我介绍 = I still gave a self-introduction

This pattern highlights contrast: one fact could have stopped the action, but the action happened anyway.

A natural English translation is:

• Although I was very nervous, I still introduced myself.

Not always. In Chinese, adjectives often need something before them when they are used as predicates.

So:

• 我很紧张 literally looks like I very nervous
• but in many contexts it simply means I am nervous or I was nervous

Here, 很 may mean very, but it can also just make the sentence sound natural. Chinese often does this with adjectives:

• 我很累 = I’m tired
• 他很忙 = He’s busy

So in this sentence, 很紧张 can be understood as very nervous, but depending on context it may just be the normal way to say nervous.

Because 紧张 is an adjective, not a noun.

In Chinese, when you describe someone with an adjective, you usually do not use 是.

Correct:

• 我很紧张 = I am nervous

Not natural:

• 我是紧张

You use 是 mainly when linking one noun to another noun:

• 我是老师 = I am a teacher

So:

• noun = often use 是
• adjective = usually no 是

Here, 还是 means still, nevertheless, or all the same.

It shows that the speaker did something in spite of the situation mentioned before.

So:

• 尽管我很紧张，还是做了自我介绍。 = Although I was nervous, I still introduced myself.

Be careful: 还是 has other meanings in other contexts, such as or in questions:

• 你喝茶还是咖啡？ = Do you want tea or coffee?

But in this sentence, it clearly means still / nevertheless.

Here, 了 marks that the action was completed.

• 做自我介绍 = to give a self-introduction
• 做了自我介绍 = gave a self-introduction / did a self-introduction

It shows that the introduction actually happened.

In this sentence, the speaker is talking about a completed event in the past, so 了 is very natural.

Because this 了 is the verb-completion 了, attached to the action itself.

• 做了自我介绍 focuses on the completed action did an introduction

Chinese also has a sentence-final 了, but that often gives a different feeling, such as a new situation or change of state.

Here, the simplest and most natural structure is:

• 做了自我介绍

That directly says the action of introducing oneself was completed.

It is mainly a noun phrase, meaning self-introduction.

That is why Chinese often says:

• 做自我介绍 = to do/give a self-introduction

You can think of it as:

• 做 = do / make / give
• 自我介绍 = self-introduction

In natural usage, the whole phrase 做自我介绍 functions like the English verb phrase introduce oneself.

You may also see:

• 作自我介绍
• 进行自我介绍

But 做自我介绍 is very common in everyday speech.

It can, but it is not necessary.

Chinese often omits repeated subjects when they are obvious from context.

So both are possible:

• 尽管我很紧张，还是做了自我介绍。
• 尽管我很紧张，我还是做了自我介绍。

The second version is a bit more explicit. The first version is very natural because the subject in the second part is clearly still 我.

Yes, you often can, but the feeling is slightly different.

For example:

• 虽然我很紧张，但是我做了自我介绍。

This is also correct: Although I was nervous, I gave a self-introduction.

But 尽管……还是…… often emphasizes doing it anyway despite the obstacle more strongly.

So:

• 虽然……但是…… = general although... but...
• 尽管……还是…… = even though... still... anyway...

In your sentence, 尽管……还是…… is especially good because it highlights courage or persistence.

It is very natural, especially in situations like class, meetings, interviews, or formal introductions.

Examples:

• 请大家做一下自我介绍。 = Please give a brief self-introduction.
• 我先做个自我介绍。 = I’ll introduce myself first.

If you want a more direct verb phrase, you may also hear:

• 介绍自己

But in formal or set situations, 做自我介绍 is extremely common.

In this sentence, 尽管 functions as a conjunction-like word introducing a concessive clause, meaning although / even though / despite the fact that.

So:

• 尽管我很紧张 = Although I was nervous

It connects the first clause to the second and sets up a contrast.

Do not confuse it with other uses of 尽管, which can sometimes mean something like feel free to or go ahead and in other contexts:

• 你尽管说。 = Go ahead and say it.

That is a different usage.

It is pronounced jǐnguǎn.

A common source of confusion is that 尽 has more than one pronunciation in Chinese:

• jǐn in words like 尽管
• jìn in words like 尽力

So in this sentence, it is definitely:

• 尽管 = jǐnguǎn

Tone-wise:

• 尽 = third tone
• 管 = third tone

In connected speech, the first third tone may sound lower and less fully pronounced because of normal tone-sandhi patterns, but the dictionary tones are still jǐn guǎn.

Yes, it helps show the two-part structure clearly:

• 尽管我很紧张，
• 还是做了自我介绍。

The comma separates the although part from the still part.

In writing, this punctuation makes the sentence easier to read. In speech, you would usually make a small pause there as well.

Yes. Chinese does not mark tense the same way English does.

Instead, time is often shown by:

• context
• time words
• aspect markers like 了

In this sentence, 做了 shows a completed action, so the whole sentence is naturally understood as past in many contexts:

• Although I was nervous, I still introduced myself.

If needed, you could make the time even clearer by adding a time word:

• 昨天尽管我很紧张，还是做了自我介绍。 = Yesterday, although I was nervous, I still introduced myself.