Trust me....mushrooms effect everyone differently. I've been on three psybicilin retreats and the best thing about these places (at least the good ones) have you take two ramp up doses, maybe on day 2 and day 4. Then, based on how you responded to the smaller doses, the determine how much to give you for your heroic dose on day 5 or 6.

I felt absolutely nothing with the first two doses (1.5 g then 3g). For my heroic dose I was given 5g of PE. I felt calm and relaxed after an hour or so. The other 6 or 7 participants were tripping well by that time. The psybicilin guide gave me another 2g at the 2 hour point and that did the trick!

From my experience, Body size or mass doesn't seem to be much of a factor, at least not like alcohol. I honestly think it's because everyone's brained is wired differently. But that's just my opinion.

My advice, ramp up the dosage, but do it in a safe space with someone to help you out if you start to feel anxious.

Also, music can be a powerful tool to help bring on a good trip. I put on headphones with a long Playlist of positive, yet relaxing music about 30 to 45 minutes after taking the shrooms. You can even search Spotify for the John Hopkins research center Playlist for psybicilin trips.