Jno's right - they might be staring at you (although rudely) for looking our of place for some reason - or are you just loud and drawing attention to yourself? Sorry - but next time, try smiling at the one who's staring. If they smile in return, it might help to show you whether they like you or not. You could always try going up to them directly, and saying - "It's rude to stare, but if you gave me a smile now and again, I might forgive you!" If that doesn't open up a conversation - forget it!