First of all, if it is concerning you, you may want to consult with a licensed therapist, psychologist, or other mental health professional who has experience in the area of sexual abuse. It would be good if they have experience treating abused males also. He/she would be the best qualified person to help you with your questions in this regard and should be able to determine better than anyone here the impact it had on your life.
I wish you well, Friend,
"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting 'Holy Shit! What a ride!'" ~Hunter S. Thompson