Me siento extraño aquí.

Because sentirse is a reflexive verb in Spanish when it means to feel in the sense of to feel emotionally or physically.

• siento by itself usually means I feel something, as in:
  • Siento frío = I feel cold
  • Siento dolor = I feel pain
• me siento means I feel / I feel myself, and it is the normal pattern for talking about your state:
  • Me siento bien = I feel well
  • Me siento cansado = I feel tired

So Me siento extraño aquí uses the standard structure for saying how someone feels.

The verb is sentirse.

In this sentence:

• me = reflexive pronoun, myself
• siento = I feel
• together: me siento = I feel

This is the 1st person singular present tense form.

A quick pattern:

• me siento = I feel
• te sientes = you feel
• se siente = he/she feels
• nos sentimos = we feel
• os sentís = you all feel (common in Spain)
• se sienten = they feel

Here, extraño is an adjective, so it means strange, odd, weird, or sometimes out of place, depending on context.

So Me siento extraño aquí means something like:

• I feel strange here
• I feel weird here
• I feel out of place here

It does not mean a stranger in this sentence, even though un extraño can mean a stranger as a noun.

Compare:

• Me siento extraño aquí = I feel strange here
• Hay un extraño aquí = There is a stranger here

Because the adjective agrees with the person speaking.

If the speaker is grammatically masculine, they would usually say:

• Me siento extraño aquí

If the speaker is grammatically feminine, they would usually say:

• Me siento extraña aquí

Spanish adjectives often change to match gender and number.

Examples:

• Estoy cansado / Estoy cansada
• Me siento raro / Me siento rara
• Me siento extraño / Me siento extraña

So the form depends on who is speaking.

Normally, no. Sentirse is much more natural here.

• Me siento extraño aquí = I feel strange here

Using estar + extraño is much less idiomatic for this meaning. Native speakers usually use sentirse to describe an internal feeling or personal state like this.

Compare:

• Me siento raro = I feel weird
• Me siento incómodo = I feel uncomfortable
• Me siento extraño aquí = I feel strange/out of place here

So for how I feel, me siento is the best choice.

Extraño is correct, but in everyday speech many people would more naturally say:

• Me siento raro aquí = I feel weird here
• Me siento incómodo aquí = I feel uncomfortable here
• Me siento fuera de lugar aquí = I feel out of place here

In Spain, raro is often the most common casual choice for weird/strange feelings.

So:

• Me siento extraño aquí = correct
• Me siento raro aquí = often more conversational

Aquí means here. It tells you where the speaker feels strange.

So:

• Me siento extraño = I feel strange
• Me siento extraño aquí = I feel strange here

It places the feeling in the current location or situation.

Yes. Spanish word order is flexible, although some versions sound more natural than others.

Possible versions:

• Me siento extraño aquí = the most neutral
• Aquí me siento extraño = emphasises here
• Extraño me siento aquí = possible in poetic or marked style, but not normal everyday speech

So the standard version is:

• Me siento extraño aquí

Because Spanish does not build this idea the same way English does.

English often uses to feel plus an adjective:

• I feel strange

Spanish uses sentirse directly:

• Me siento extraño

The meaning is already contained in the verb form siento and the reflexive pronoun me, so no separate word like am is needed.

Yes, absolutely. In fact, it normally does.

Me siento extraño aquí describes how someone feels at this moment or in this situation, not a permanent part of their personality.

It suggests something like:

• I feel odd here right now
• I don’t feel like myself here
• I feel out of place in this place

That is one reason sentirse works so well here: it focuses on a current inner state.

You would say:

• Te sientes extraño aquí if speaking to a masculine person
• Te sientes extraña aquí if speaking to a feminine person

Breakdown:

• te = yourself
• sientes = you feel
• extraño / extraña = strange
• aquí = here

In Spain, if you are speaking formally to one person, you would say:

• Se siente extraño aquí
• Se siente extraña aquí

Yes, but they are used differently.

sentir

Usually means to feel something directly:

• Siento frío = I feel cold
• Siento dolor = I feel pain
• Siento tristeza = I feel sadness

sentirse

Usually means to feel in a certain way:

• Me siento bien = I feel well
• Me siento mal = I feel bad
• Me siento extraño aquí = I feel strange here

A useful shortcut:

• sentir + noun
• sentirse + adjective/adverb-like description

Yes, it is fully natural in Spain Spanish.

That said, in everyday conversation in Spain, many speakers might prefer:

• Me siento raro aquí
• Me encuentro raro aquí

But Me siento extraño aquí is still correct and understandable in Spain. It may sound a little more neutral, literary, or thoughtful depending on context.

No, not in this sentence.

The verb extrañar can mean to miss in some varieties of Spanish, especially in Latin America:

• Te extraño = I miss you

But that is a different structure. In Me siento extraño aquí, extraño is not a verb. It is an adjective describing the speaker.

So here it only means strange/weird/out of place.