Please help. Need help

Guys and girls please help. Well I have a crush on this girl. I have talked to her around five to six times and I think you can call us friends. But I am getting tensed while talking to her. I am even not able to bring out topics to talk on. My mind goes blank. My voice is also a bit low ( am not used to speaking loudly. Am A shy guy) . So my voice also gets tensed up and I screw up big time. It is bringing my confidence down and I feel like she will never like me. She is a kind of a girl who iis famous, and got lots of friends (guys also) . But I want to be the one for her. How do I impress her. Let her know how awesome I am in certain things. How do I make our friendship better? How do I make her blush if she thinks of me? How do I start up conversations and talk nicely without getting tensed?