Eu fico chateado comigo próprio quando não estudo.

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Breakdown of Eu fico chateado comigo próprio quando não estudo.

• estudar: to study
• quando: when
• não: not

Questions & Answers about Eu fico chateado comigo próprio quando não estudo.

Why does the sentence use fico and not sou or estou?

In Portuguese, ficar often means “to get / to become” (a change of state), not just “to stay.”

• Eu fico chateado ≈ I get upset / I become annoyed.
• Eu sou chateado – wrong here; ser describes a permanent characteristic (e.g., I am an annoying person).
• Eu estou chateado ≈ I am upset (describing your current state, not the process of getting that way).

So fico focuses on the change that happens whenever you don’t study: you end up feeling upset with yourself.

What exactly does chateado mean here? Is it “angry,” “upset,” or “bored”?

In European Portuguese:

• chateado usually means annoyed, upset, bothered.
• It can sometimes be a bit milder than zangado (angry), depending on the tone.

So in this sentence, fico chateado is best understood as:

• I get annoyed/upset with myself (for not studying).

For “angry,” you’d more likely hear zangado:

• Eu fico zangado comigo próprio quando não estudo.
  → I get angry with myself when I don’t study.