I've never seen or heard my neighbor

I've been renting an apartment going on 4 years. I noticed I have a neighbor 3 years ago because he/she gets doordash every once in a while and even gets apartment notices, im pretty sure they wouldn't put mail on a vacant door plus maintenance knocked on their door before. I find it weird that I never heard or seen this person before. I do work 12 hours but I don't work everyday. I was watching Jeffery Dahmer and was like you know what if it is someone over there I'm just going to mind my business lol maybe I'm overthinking. My apartments is an inside high rise. So we're going to come across each other 1 day but nope not this neighbor. I don't want to seem like a creep but am I tripping? 😂