How to realize if a girl is attracted?

Anonymous
Some may say it's low confidence or what. I have a hard time trying to figure out if a girl is interested in me. A lot of the time I won't go up to girl unless she shows signs of interest. There are times that a girl might look in my direction, but I don't know if she is actually checking me out, looking at the guy behind me or something else. So my thing is how can I figure out if a girl is attracted, without looking like an idiot?
How to realize if a girl is attracted?
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