i feel so bad for you over what happened to you as a boy. i too was 5 when it started - but it was a step-dad - not a real father. i would think that what you endured would even be worse. the shame you feel is natural - but it is a result of what was done to you - not your choice or fault.
i am glad you have found us and decided to speak out. i hope you will find comfort, support and encouragement here among others who have had similar experiences and can relate to what you feel.
"That you are here - that life exists, and identity; that the powerful play goes on and you may contribute a verse. . . What will your verse be?" Robin Williams as John Keating in "Dead Poets Society"