Using psychedelics is like snow skiing. You don't start off on the highest or fastest ski run. It's the same with dose. Some people have a MUCH lower tolerance to psychedelics, meaning the people you're with are all doing 2-3 tabs and having a great time, and you can only safely handle 1/4 of that. This is PERFECTLY NORMAL. Only you can establish your own safe psychedelic dose. Start with a 1/2 tab and INCH FORWARD. Advance no more than 1/4 tab after that, and dose only once in a session.
People disagree with me, and I'm fine with that, but never smoke weed when your tripping. That can easily cause a bad trip, and it's happened to me repeatedly. There is always a risk.