I honestly think this a matter of experience. The more often you have the experience of people directing their attention at you, the more comfortable you will get. Eventually, you might even come to enjoy it. It might take awhile to get to that point for some people.
Your question of why someone should pay attention to you seems strange. There are many reasons, good bad and neutral, why someone would give you their attention. It seems to be not a question of your worth, but rather what has brought you into their attention.
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