Today I did something very stupid, I hope it doesn't ruin my future.?

Im going to get straight to the point, I had sex outside. It was around empty buildings I looked around didn't see any cameras, but the person I was with said he had seen cameras (once we left so I couldn't go double check) this was private property. A security guard came and told us we had to leave I am guessing he had seen me just standing there but this was after the sex. I looked good to make sure there was no cameras, my guess is the guy just assumed that he had seen cameras but I am about 80% sure there wasn't any. But I always second guess myself, and now I am freaking out because I know inconsiderate people would probably post this video all over the internet and I don't need that. The only thing I could do if that ever did happen and someone I knew had seen it is just deny it. I know I am an idiot for being so careless.