Brain partially resistant to psychedelics

Hi! I was wondering if any of you have my problem. I seem to be affected by psychedelics much less than an average person, and to that I include mushrooms, lsd, dmt.

For example, the latest experience with dmt was very strange, strong bodily effect, but no visuals whatsoever, except slight colour contrast increase. I kept trying and spent 500mg in 5 goes. (Extracted and water washed, in a vape, mixture was 3:1).

Lsd (100ug) caused almost no visual effects, until I did a large dmt dose in addition to it, where what I was seeing was changed, by dimension and appearance, but I was still able to walk and navigate the apartment.

HELP!