I'm not big on drugs, but I tried mushrooms, and acid on separate occasions. I had really positive experiences with both.

I did acid on January 1st, 2013. I had all of these activities planned with my friend (making music, playing instruments, drawing, painting) but we ended up being too fried to make anything work. Shortly after the acid kicked in, I started realizing that everything in reality wasn't really "real," in any objective knowable sense. I spent a lot of time wrestling with the idea on my trip. I eventually ended up communicating with god later when I was alone, and he "told" me that everything was infinite, and sort of repeats over and over again in different ways, and that everything is connected and is really just one thing. He communicated that reality was made to keep me occupied, which was a way of keeping himself occupied since I'm part of him. He told me that every night while I sleep, I realize that I'm god, and I have infinite power for a while (dreams) but every morning I forget. The reason for this is to have a mundane existence that can contrast with the magic of infinite power while dreaming. It keeps things interesting, which is the whole point.

This was just an acid trip, and is an elaborate story made up by my brain while tripping, but it was a ton of fun, and I was elated the whole time. One of the best things about the whole experience was the impact it had on my anxiety. I had struggled with social anxiety since I was a kid, and it got horrible as an adult. I would sometimes starve myself rather than go to the market because my anxiety was so bad. After doing acid, my anxiety was permanently halved. It was a huge turning point in my life.