I think my father may have molested or raped me as a child, how can I be sure?

If you are questioning, it may be more than likely you were. Sexual abuse is not just penetration. Sexual abuse is also anything done to you or you witnessed which made you uncomfortable and uneasy. I am not a therapist. I am a survivor of childhood sexual abuse. If you want to check out more on this, "The Courage to Heal" is a really good book to look at. Please speak to someone about this.