To answer this question I will first have to go back in time to the period before I ever had a psychedelic experience.
I was interested in nature, was wondering about the infiinite cosmos, made drawings and cartoons, wrote short stories and I loved my father's weird music (Genesis, Marillion, Pink Floyd). But that was my private life. With my friends I was different: shoplifting, vandalism, making nasty jokes, etc.
When I was 15 my school celebrated its lustrum, and the them was "the 60s", I had my first puff, and everything evolved from that. My philosophical side became public through articles in the school paper, for which I became en enthusiastic writer and cartoonist. I stopped doing mischief, other than secretly smoking dope.
LSD soon followed, and it again had a profound effect on me. It made me radically clean up/simplify my room. During the first trip I took out my wooden bed, old carpet, childish images on the wall etc. During the second trip I became a vegetarian.
LSD made me very straightforward, not just during the trips but especially between them. Brutally honest, except for the fact that I used drugs, for my father had threatened to severely punish whoever would take drugs. He liked psychedelic music, but was completely in the dark about cannabis and psychedelics.
Unfortunately I also became religious, which kind of backfired on me, because I joined a religious order, so no drugs for 6 years... Well, I actually dropped out a couple of times, but it took me a while to really detach myself from all the BS.
The first time I did a high dose of mushrooms in a dark, silent room was in December 2005. But the experience itself didn't change my lifestyle as much as my first encounter with LSD had done. I guess all the talk about psychedelics (by McKenna, Alex Grey, Rick Strassman, all of whom I got to know at that time) has been much more influential.