A verb becomes reflexive when it’s used to talk about doing something to oneself, such as seating oneself at the table or waking one’s self up. In these cases, the subject and object of the sentence are the same. » Reflexive verbs express what a person does to him/herself.
Almost any verb can be used reflexively. Whenever the subject is receiving and doing the action at the same time, it’s reflexive. To make a verb reflexive just add a me or se to say myself (me), or yourself, himself, herself (se). These are called Reflexive Pronouns:
Eu me
Você se
Ele se
Ela se
A gente se
Eu não me lembro. I don't (myself) remember
Eu me chamo Juliana. I call myself Juliana.
Não vou me preocupar. I'm not going to worry (myself).
Você se machucou? Did you hurt yourself?
Eu me sentei. I sat (myself) down.
Nós nos divertimos. We enjoyed ourselves.