First DMT experience. Felt (and saw) a presence?

I bought a DMT vape cartridge a few weeks ago and decided i was finally ready to try it out. I started yesterday with a single 5 second hit, just to test the waters. All I felt was this "pressure" and i had little-to-no closed-eye visuals. My ceiling started to shake slightly, though. Then we come to today; i guess i was too eager so i decided to try it while my family members were upstairs, but that wasn't an issue. My brother trip-sat me, and I took about 2 8second hits. The entire time, my throat hurt a lot and i was scared of coughing loudly/puking and i feel like it "kept" me mostly present throughout, although i couldn't feel my body at some points. Instantly, i closed my eyes and experienced almost this dark-lit or greyed out chain of folding geometric visuals. They weren't colorful for some reason. It went on for a little while and had music playing. At some point, to what i can assume is the peak, I opened my eyes many times thinking someone(or my brother) was opening the door to my room, but when i realised it was the drug, i closed my eyes again. In the midst of my visuals, i "saw" a humanoid figure appear from the leftmost side of my field of view. I could tell he was male. He proceeded to "open" a door to a special kind of room, maybe it was a geometrical box, or a simple room, but it was also greyed-out. That whole interaction lasted 5 seconds, and the room faded away back into the standard folding, greyed out visuals. I came down pretty quick after that and knocked some sense into me that doing this with family members present upstairs was not the best idea. For a first time on a low-dose trip, i'm pretty impressed to have sensed (and "saw" his aura?) of an entity opening a door. Does it hold any meaning? Is he known at all? I'm not gonna be touching this substance for a little while, not until i can experience it alone with a tripsitter and an empty house.