Dude start off with something more mellow, or you're going to be extremely disappointed if/when you decide to try other drugs. Psychedelics are so intense that I don't even consider them to be drugs. They're something else entirely. A "god molecule", if you will.
I'd suggest starting off with Nitrous Oxide and/or weed first. Nitrous has psychedelic properties (but without the visuals), and cannabis can also be psychedelic when you have no tolerance. Also they last more in the minute range—not hours (especially nitrous)—so they'll wear off a lot quicker should you decide you don't like the feeling.
Trust me, I've tried every drug under the sun. I'm a daily or near-daily user of several substances; psychedelics like shrooms are the one substance that I avoid. Only for special occasions, once every few years at most. Not the very first thing I'd try. It would be the very last.