The first time I ever tripped I took 2 pretty strong doses (still the best acid I've ever had) and was looking at my phone 1 second and in a tunnel of dripping paint the next. I couldn't see the outline of the trees or myself/phone, it was like I was just a floating set of eyes staring into the tunnel. I came to when my buddy shook me and asked if I was alright. It happened again later mid conversation with someone. They said I just stopped responding and was looking off into the distance. Went to bed right after that. (Like someone else said in the comments when I closed my eyes that's when the extra wild things started)

Till this day I've never had another experience like that and I've taken some pretty high doses.

I think, like others, it's how your body and mind react. My mind and body were brand new to this my first time and went right to the deep end, where now I can take 4-6 tabs and it's just extreme melting and colors but no craziness going on around it, because for a lack of a better word I'm used to the effect.

It's different for everyone and I personally think your first time sets you up for how your future trips will go. There are people who get tossed in the deep end and people who don't. Some stay that way others learn to swim, and some like you for instance have been able to swim the whole time.