I can't help being an unintentional flirt? Attachment problems?

I have the same problem. I get accused of flirting with everyone but I'm just very smiley, giggly and talkative, and I'm the same with girls, old people, dogs, as with boys. You need to try to be more serious/quiet around boys, because they will read signals where there aren't any! A lot of boys think a smile means "Yes I will have with you".