I keep seeing and hearing things that aren’t there?

Ive lost track of how long it’s been going on for, but it happens enough that it effects my daily life. The sounds i hear are almost real things, like people talking in a different room, or other regular sounds you might hear in the background. The problem is they’re just off? The “conversation” i hear don’t contain words, and they dont follow the typical vocal tone of actual conversation, it sounds fake? And other noises like machine? Or crying sometimes but they all sound off. A friend brought it up because when we were hanging apparently I reacted to a sound that wasn’t there, they mentioned i might want to get it checked out, but when i think about it i sound crazy. Seeing things not so much, but when I do I cant make them out? Its almost like if you dropped ink into water but it takes a shape, but every time i see it my heart sinks, i genuinely have sinking feeling in my stomach and its like fight or flight. The other night I sitting in my room (at night) the door was open nothing was in the hallway but when I stood up and looked again i saw something it looked like a inhuman face or snout with eyes in the wall (it was hard to make out) but I frozen for the first time and after a few seconds brought myself to close my door. This really freaked me out because usually I know, but this felt so real, i couldn’t bring myself to open the door after.
This doesn’t only happen at night, but its getting excessive and hard to tell from real things. I try to tune it out most of the time but sometimes I end up ignoring friends who are calling for me from other rooms or such. I dont do drugs, im not on meds or anything? Does anyone have any idea what? Or why this is happening?