No. We are not. A monster is someone who uses their power to hurt people instead of helping them.
I used to be a monster. I was angry and scared, and I wanted to revenge on the man who killed my parents. Or rather, who's technology killed my parents. So my brother and I let them experiment on us, give us these powers. I only wanted to hurt people.
It was only until recently I realized that I was in the wrong. I let my anger and grief and desire for revenge get in the way of what I could truly accomplish with my powers. Which is the ability to help people and do good. So, I became an Avenger. To make up for what I had done.
So maybe, I was a monster. Maybe in some way, I still am. But I don't think I am one anymore. I don't want to believe that I am. I choose to use my powers to do good.
I don't know you very well, but I don't think you are a monster just because some man says that you are.