There is so much unknown about psychedelics, that it is a loaded question to even ask what is a "normal" response to them.
Some people require substantially more of the same substance to feel the same effect as others.
As for the blackouts, are you on any medications? Drinking or mixing substances can have weird interactions.
Also, everyone has different brain chemistry, and no two people or experiences are the same.
I know a friend who is completely immune to psilocybin mushrooms, even at monster doses.
If I were you I would try focusing on the minds effects, and not get hung up on getting trippy visuals,
and see where that takes you.
It may be you are just wired differently, and won't get the same visuals as your friends get, ever.
Or maybe the psychedelics want you to ignore the pretty colours and go deep into your own mind.
You may be rewarded for not focusing on the visuals and just letting them do their thing.
If you feel something is wrong or scary with the "blacking out" maybe see a Dr.
Having a sitter for your trips would be good advice if this is a recurring theme.
A sitter may also be able to help you stay awake and see the visuals, if that's your goal.
High doses of DMT and mushrooms will cause a trance, that is similar to sleeping/dreaming, for me.
Psychedelics are still such a mystery, what is normal?
Be safe,
I hope you find what you seek
AcidShard