For this case we have to: 
According to the conjugation of the verb "ir(go)" imperative (simple perfect preterite) we have: 
"I went": It would be translated into Spanish as: "Yo fui" 
On the other hand, according to the conjugation of the verb "ser / estar (to be)" indicative (imperfect preterito) we have: 
"I was": It would be translated into Spanish as: "yo era / yo estaba" 
Answer: 
"Yo fui" 
"yo era / yo estaba"