Wait until your boss gets back and talk face to face. Do not compare yourself to others. You have very valid points but theses points need to be about you, not about someone else. Nothing wrong in asking for more training and not just from a bit of paper, that shows you have real interest in getting it right. Work on you.
__________________
Pegasus
Got a quick question related to mental health or a treatment? Ask it here General Q&A Forum
“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein