Is it normal that i've created in imaginary world inside my head?

Okay, so I've already talked to friends about this and apparently having an imaginary life inside your head is normal. I just couldn't fit what I actually was concerned about in the title box.
Anyway, so, I've created this entire alter ego in my head and I have literally mapped out their entire life. Where they were born, their upbringing, and even what happens when I'm super old. What I'm not sure about is the fact that I've made "myself" go through really traumatic experiences that I had to overcome. When I was a child, I was abused (sexually, physically, verbally), neglected, been taken away from her birth parents and adopted by a family in another country and when she was older, went through an abusive relationship. I don't imagine the bad parts, or focus on them when I'm daydreaming, but I'm just aware that they happened and I'm overcoming them. I also have this random fascination with English not being my first language, even though in real life it is. Is this normal?