How did porn change your fantasies?

I think I was 10 when I was first introduced to porn. The internet was about 2 years away at the time so there were magazines and video cassettes. My friends parents had gone away for a weeks holidays and my friends older brother found his fathers stash of porn films. So one day we were in the house and in the living room my friends older brother and some of the other older kids, were watching what seemed like a very badly acted and produced movie. But soon enough things took a turn and there were boobs and dicks everywhere. My 10 yr old self was shocked, but pretended not to be, like I watch porn all the time, no biggie. But it was. I remember after a while feeling not so good, like this was not right, and secretly I wished that they would put on ET or something instead. But from that moment on my imagination changed. I went from a kid who imagined kissing girls would be nice to thinking other more hardcore stuff. I often wonder how my imagination would be if I had never seen those images..........I saw a TED talk about porn where the guy says the same thing about his experience, that porn takes away the love and sensuality and replaces it with aggression and things that I know are not good for the soul. It seems that now these things are celebrated, that having orgies or whatever is a good thing, the more hardcore the better. But Im not so sure these things are true. If porn had never existed would we be different? Or have people always been drawn in by the darker side of sexuality? My goal in all of this is to change my imagination. Not just go a certain number of days, but to remove the effects from porn on my brain and my spirit once and for all.
How has everyones experience of porn changed your own imagination and how you see sex and love?