How to tell if a girl is actually flirting with me?

So I'm a really tall guy; around 6'11, and I get a lot of girls just gawking because I'm so tall. A lot of them also say things like "Omg, you're so tall", "how tall are you?", etc

But I don't know how much of this is flirting and how much of it is just girls being curious, non sexually, about my extreme height. Anyway to distinguish one form from another?

I almost always misread a girl and think she's interested in me when she's not because the fact that she's initiating a conversation with me, which could imply an indicator of interest. And girls, when you say things like I've mentioned above to tall guys, are you usually trying to express interest?
How to tell if a girl is actually flirting with me?
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