Im going to say something that might sound harsh but hear me out. A lot of ppl i’ve met who say this struggle with social cues and they don’t realize it, and that might be you. They might feel like ppl avoid them for no reason, but in reality, it might be bc they keep missing things socially. If you feel like that might be you, solution is to find ppl who are understanding and patient with you and your personality.
I don’t think understanding and patient people are always weirdos. It just comes down to whether or not they want to be around you despite you missing out on important social details, if you feel like you’re someone who struggles with that. Those kind of people are rare, but they’re all different. If you feel like you’re definitely fine with social cues, then the reason you feel isolated could be any number of things.
There are SO many and they depend on the situation, the culture, the language, the person you’re talking to, etc. They can be shown through facial expressions, vocal tone, body language, or something else. Everyone misses them once in a while, but some people do it over and over again. Do you want something more specific?
This is just one really common example. oversharing, either in a group conversation or just between two people. Maybe you don’t do this, but I feel like this is a common example. The person you’re talking to is very rarely going to tell you they’re not interested, so it can be hard to know if they’re into what you’re saying or not. If they’ve said “uh-huh, wow, oh cool, nice,” or something like that too many times, they likely don’t care. THAT’S the social cue.