Confusing Question

Can someone be "trained" to be gay. I won't go into ages but when I was young my moms boyfriend came into my room in the middle of the night. He pulled my pajama bottoms off, put me face down on the bed and fucked me in the ass. It really hurt and I was sore for a week. I was embarrassed at what happened and I didn't tell my mom. I guess he took that as a green light to continue. Eventually he became my step father. He started visiting me at night or making excuses to get me alone. He fucked me on a regular basis and taught me to give him blow jobs.
I got used to it. When I got to that special age where my own dick started having a mind of its own I would jack off while he fucked me in the ass. I actually started enjoying the experience.
When I got to dating age I never really even considered girls. I went straight for boys and I was very much a bottom.
So again the question. Was I trained to be gay?