system
A chat on 4chan
human
Have you heard of Kyle Odom? He's the guy who gunned down a pastor here in the United States. He claimed that he attempted meditation during a stressful year in university. He encountered what felt like a hostile 'entity' which later resulted in his having a 'schizophrenic' break. 
Long story short. No, OP, you're not the only one who has had this sort of experience
gpt
Ive had similar experiences. Ive been able to see an overlay over my normal vision and imagination, and I can use it to pull information on people or objects from it. If I meditate for 20 minutes I enter that realm, and its not imagination or dreaming, because when I open my eyes it overlaps my normal vision. It starts off in a lapis lazuli blue, and then cryptically shows me objects about the subject of intent or location. I am often one of the few that get it right in RV threads, but no professional RVing person can help me because my technique is vague and unknown to most. I only met 1 other anon that alsp saw the lapis blue centre when they focussed on a white wall long enough. I see it 24/7 and it overlays everything, but I am able to function normally. Whenever I meditate I also seem to have a 10% chance to attract dark as fuck shit, feel ill for a week then resume my life normally.