Do you meet a girl you love but can't say I love you?

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I often see girls in the street and enjoy them,even someone are my friends,but I don't say loving to them,this make me unhappy,and suffering.what can I do?Born a introverty boy,I am puzzled that I nealy can't look at the beauty girl.If you were I,what will you do?do you meet a girl you love but you can't say I love you? If yes,it must be a pain forer.