Girls; how can I stop being oblivious?

Anonymous
I am so tired of being oblivious when girls throw hints at me. Like in a store today, two girls were following me, but I didn't realize it until I had already walked out of the store.because my friend told me what was going on after the fact. I made eye contact and everything, but I didn't understand what their deal was.

If I can get some advice on what to do in these type of situations maybe I can react differently when the next opportunity arises

How can I catch on to these hints of interest and how do I approach the situation.like what should I say? I hate using cheesy pick up lines.I just don't wanna seem like a complete wierdo, cause I'm not.
Girls; how can I stop being oblivious?
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