Aburrido covers both boring and bored. English uses two different words to mark the difference; Spanish uses one word and makes you choose ser or estar.
Es aburrida · Son aburridos · Están aburridos
Watch the agreement: she is boring is es aburrida, not "aburrido". Spanish is more subtle than the English here.
Where you are is a state, but where you are from is characteristic of you. Spanish puts the preposition first: literally from where are you.
¿De dónde eres? (where are you from?)
De is from or of, and it turns up as a building block in Latin-English words.
Deliver is de plus something to do with freeing, so "from freeing". That makes much more sense in the older uses, to deliver a baby or deliver me from evil, than in the modern sense of delivering a package.
Libre against English -liver is another instance of the b and v grey area, like saber and savvy.
Libre ends in e, so it does not change for masculine and feminine. Only adjectives ending in o change.
Estoy libre · Soy libre
Both work here, with different meanings: estoy libre is free from work or exams, a state. Soy libre is being a free person, a characteristic.
Some adjectives take both verbs, some take only one, and there is no way for a learner to know which. Estoy ocupado is fine, but "soy ocupado" is bad Spanish.
soy una persona ocupada (I am a busy person)
The trick: say I am a busy person instead. Then persona is what goes with soy, and saying I am a person is about as characteristic as it gets. Whatever describes persona after that does not matter.
Soy una persona libre · Soy una persona casada · Somos personas ocupadas · Es una persona preocupada
Remember persona is feminine because the word is feminine, not because of who is speaking. A man also says soy una persona ocupada.
Estoy ocupado · Estamos ocupados · Estoy preocupado · Está preocupado
Careful not to confuse casado (married) with cansado (tired).