How to limit interaction with unwanted people that is necessary to deal with in daily life?

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As an introvert, I’m very sensitive to my personal needs and I’ve become aware of a series of behaviors that I do subconsciously that serve the purpose of limiting unwanted social interaction.

My eyes instantly avert whenever they encounter anybody else’s eyes that I’m not immediately interested in interacting with. This means everyone except close friends and coworkers. If you were to see someone you might want to interact with and they won’t meet your gaze, you won’t want to interact with them.

If I’m feeling social, then I will stop this behavior and hold people’s gazes.

If someone finds a way to get around this defense, I have a second one ready. I am really good at being boring. I give one, two-word answers to people’s questions, and are quick at sussing out what people want and give it to them as quickly as possible so I can move on. Even the most determined interlocutor can’t penetrate my wall of apathy. But they try anyway, which leads me to my third and final defense.

Emotional callousness. I am really good at not caring about people’s problems. This is because usually when I try to help out, I come to find out that most people create their own problems. I can’t help someone to stop creating problems for themselves. If it's something like that then there’s not much I can do. If it’s not an unwanted person, then I can listen to them carefully and give them emotional support and advice if they want it. But unwanted people will get treated to me constantly looking away, interrupting them, and generally not respecting their demands on my attention.