How can I tell if a girl is shy, playing hard to get, not interested, or getting bored and annoyed?

It's very confusing, because almost all the time, girls seem to make it very extremely un-obvious whether they like a guy or dislike a guy, a lot of times it takes many guys a long time to realize that the girl likes him or dislikes him, rejected him, etc. It seems that girls always give non-verbal hints. Anyway, let me get to the point, how can I tell if a girl is not interested, getting bored, creeped out or annoyed? Or if she is shy or playing hard to get? Because I don't want to bother or creep out a girl, I don't want to get accused of stalking or harassing a girl, because I never want to do that. I would never stalk a girl, I never follow girls around. Because I often misinterpret a girl being shy meaning she is not interested and does not want anything to do with me, I get confused and have a hard time telling the difference. So what is a girls body language like, facial expressions, tone of voice, etc., like when she is not interested, getting annoyed or creeped out, is shy or playing hard to get? What are the obvious signs besides little or no eye contact, does not smile, never calls or texts you back? Are there any other signs?
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How can I tell?
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If a girl is not engaging me in conversation, she is not reciprocating, like she is only gives one-worded responses, little or no eye contact. Does that mean she is not interested? or could I be asking the wrong type of questions?
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Could it also mean I started the conversation the wrong way? What are good ways to approach a girl for the first time and start a conversation?
How can I tell if a girl is shy, playing hard to get, not interested, or getting bored and annoyed?
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