Penso alla mia carriera.

Because alla is the combination of a + la.

• a = to / about (used after pensare in this meaning)
• la = the feminine singular definite article

Since carriera is a feminine singular noun, a + la becomes alla.

So:

• pensare a = to think about
• la carriera = the career
• pensare alla carriera = to think about the career

With mia, you get alla mia carriera = about my career.

In Italian, the verb pensare often takes the preposition a when it means to think about someone or something.

So:

• pensare a qualcosa = to think about something
• pensare a qualcuno = to think about someone

This is just how the verb is built in Italian. English uses about, but Italian normally uses a in this structure.

Examples:

• Penso a te. = I’m thinking about you.
• Pensiamo al futuro. = We’re thinking about the future.

Penso is the first-person singular form of pensare in the present indicative.

That means:

• pensare = to think
• penso = I think / I am thinking

So Penso alla mia carriera literally means I think about my career or I’m thinking about my career, depending on context.

Italian often leaves out subject pronouns when they are already clear from the verb form.

Since penso already means I think, the pronoun io is not necessary.

So both are possible:

• Penso alla mia carriera.
• Io penso alla mia carriera.

The second one adds emphasis, as if you were saying I think about my career.

In Italian, possessive adjectives like mio / mia / miei / mie usually go together with the definite article.

So Italian normally says:

• la mia carriera = my career
• il mio lavoro = my job
• i miei amici = my friends

This is different from English, where you usually say just my career without the.

Because the sentence has a + la, the full phrase becomes alla mia carriera.

Because mia has to agree with carriera, and carriera is a feminine singular noun.

Agreement works like this:

• masculine singular: mio
• feminine singular: mia
• masculine plural: miei
• feminine plural: mie

So:

• il mio lavoro
• la mia carriera

Yes. The Italian present tense often covers both ideas.

So Penso alla mia carriera can mean:

• I think about my career — a general idea or habit
• I’m thinking about my career — what I’m doing now

The exact meaning depends on context.

If you want to strongly emphasize the action happening right now, Italian can also use:

• Sto pensando alla mia carriera. = I’m thinking about my career.

Both can refer to thinking about your career, but there is a nuance:

• Penso alla mia carriera = I think about my career / I’m thinking about my career
• Sto pensando alla mia carriera = I’m thinking about my career right now

The version with sto pensando makes the ongoing action more explicit. The simple present, penso, is more flexible and very common in Italian.

A simple approximate pronunciation is:

PEN-so AL-la MEE-a kar-RYE-ra

A few notes:

• penso: the e is short, and the s is voiceless as in see
• alla: both l sounds are pronounced clearly
• mia: usually sounds like MEE-a
• carriera: the double rr is stronger than a single r, and the stress falls on -rie-

If you want to sound more natural, pay attention to the double consonants in alla and carriera.

Yes, in this sentence it matches English career very closely. It refers to your professional path, advancement, or working life.

So la mia carriera means my career in the usual English sense.

Depending on context, Italians might also talk about:

• il mio lavoro = my job
• la mia professione = my profession
• il mio percorso professionale = my professional path

But carriera is perfectly natural here.

Yes, but the meaning changes slightly.

• Penso alla mia carriera. = I’m thinking about my career.
• Penso alla carriera. = I’m thinking about career / the career.

Without mia, it sounds less personal and more general, unless the context already makes it clear whose career you mean. In most everyday situations, if you mean your own career, alla mia carriera is the most natural choice.