Are my feeling right?what do i do?

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So of course there's this guy and i dont know how to describe it but whenever im around he makes me feel like im the only person in the room like everything else is a blur and im in the middle shinning. The fact that i have feelings for him is driving me crazy because i dont wanna be that pathetic girl that created an image far from reality and thought this guy actually likes her, but i tested the feeling with all the other guys and i never got it , plus its always there. Have you ever gotten that "your the only person in the room vibe" how did it turn out? did he actually like you ? and guys , have you ever felt that she is the only person in the room? I need advice , what do i do now?