Really shy... need advice please?

I work in a real estate office. Upstairs is a doctors office where a guy that I'm attracted to works. He has to pass my office everyday so we've seen each other a lot and even smiled at each other but never spoke to each other. Problem is I really want to talk to him but I'm so shy, my whole life I have been. My last boyfriend and I were in a room together with other friends for 5 hrs before he finally spoke to me and I'm glad he did because we were together for 4 years before we broke up but if he hadn't spoken to me that day I would've never spoken to him and we would've never been together. I need help here. My friends keep telling me to talk to him first but they just don't understand I'm too shy and I just don't know if I can. Can somebody help me? What can/should i do?
Really shy... need advice please?
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