Eh, well imo, guys do not like desperate girls so just avoid acting like that.

But you can try to dress up in some cute clothing perhaps, maybe try to be a bit flirty to attract these guys' attention.

As for getting over shyness, the more comfortable you are the better.

Have you talked to any of these guys before? Are you friends or do you just know them but don't really talk them? It's really best to get to know a person before you do things like go on a date together.