Haha I only weigh 135 so 20 would straight up kill me! I usually stop at 6 which is enough to get me pretty trashed (so nice being a literal lightweight!). I think your experience would have been a lot better if you had taken it slower and done less, but you said it was all just an oversight etc. The first time I drank was at my friends house over thanksgiving break and I was really careful to not overdrink while my 2 friends ended up vomiting into the same toilet, at the same time

Now that you've tried it you should focus on honing into the golden zone which is enough to get you feeling good but then stop there before you start getting sloppy, sick, super hungover, etc. I dunno if you've tried beer but it was pretty disgusting the first time I tried it and has only slowly grown on me.