Sometimes it’s important not only to speak your mind but to know how, where and ofcourse when to let all your thoughts flow. This may be a bit of loooong advice, but it’s just food for thought:
I am an animal behavioralist and I’m currently majoring in psychology (of people). One of the most important things that we as humans have in common with animals is communication. Example: when a litter of puppies is born they behave in different ways and watch how others react and thus they learn to communiate. My advice to you, start small. If you’re interested in a guy hint at it watch his reaction. Show you’re interested by asking questions instead of screaming “HEY I WANT YOU!!!!” See if this motivates him to be more interested in talking directly to you. If so, slowly but surely you can begin to express how you really feel.
It’s a safe plan that you can slowly become comfortable with. And that way you’ll be positive that the person you’re interested in is interested too (reduces your chances of being really embarred later :)

Good Luck Karen,
AVG