Guys, how would you want a girl to show her interest if she's very shy? What should I, myself, do?

I'm normally pretty friendly and outspoken even with strangers. I'm not really a timid person, but I do become very shy when attracted to someone.

I know why all that happens, it's the crush, but I hate that I can be my usual smiley, playful and friendly little me around most people EXCEPT my crush. How am I supposed to find someone, get him interested and show a little interest myself when I'm like... this? :(

Examples from yesterday:
• After not seeing him for two weeks at the local boxing gym, I can barely speak up and my hi sort of comes out like Ross Geller's "hi..." (in lower voice).
• When he looks at me, I can't take it and I look frantically away.
• I get so nervous around him, I mess up the training... even the most basic stuff!
• He walks around the gym shirtless and I look away instead of looking at him and maybe smiling up at him and/or saying something playful, I do turn away because a part of me makes me not to make my interest too known.

I'm working at my self-esteem but I don't really think this is a self-esteem thing.

How to show interest in him if he makes me act like this in his presence? All guys hate it right?

Guys, how would you want a girl to show her interest if she's very shy? What should I, myself, do?
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