Why do people seem to lack awareness and walk into you, elbow you, touch you by accident etc. and invade your personal space?

Seems like almost everyone does this to eachother and they all seem unbothered by it. But I’m constantly having to move away from people or move seats because they’re obnoxiously loud, invading my personal space or constantly touching me by accident. I hate this!!

Why do people seem to lack awareness and walk into you, elbow you, touch you by accident etc. and invade your personal space?
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