Why do people feel its ok to be rude to me?

I'm a quiet, socially awkward girl who is very nice, kinda shy. I might not be the warmest, most charismatic or outgoing person who knows how to establish immediate rapport with people but I am a very kind soul. I have just noticed that people just speak to me however way they want sometimes. Especially at work where clients feel like they can just raise their voice at me whenever something else pisses them off. Or coworkers would feel its ok to mutter something rude to me. Everyone has personal opinions about those that they work with but most of you will keep them to yourself, instead of directly saying it out loud. I don't see other people being spoke to so rudely. Just not sure why this only happens to me.

Why do people feel its ok to be rude to me?
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