There are monsters living under your bed

When I was a child I used to believe that there were monsters in my room in the night. I was very scared. Then I used to turn on the light and so I´d fall asleep.

When I was a little boy I use to believe in monsters. I was afraid of them. One day,I was having a nightmare and my parents came to see me. I told to them my nightmare and my father left and he came back one minute later with our dog. He was ask to him to look under my bed. He didn't find anything. I stopped believing in monsters but I am afraid of robbers now

I used to believe there was a monster under the bed.
I used to believe that something or someone was following me.
I used to believe a tree would grow inside me.