Welcome to Fluther!
Most of us have been in your shoes at some point, so it’s understandable how you feel. What I found helpful is making a connection with the crush. It just needs to be something quick and sincere. What do you know about this person from your own observations?
Once upon a time, I met a guy that made me weak at the knees. I noticed he was a coffee drinker, so the next time we were scheduled to attend the same meeting, I brought in a cup of coffee for him. I quietly placed it in front of him and took my seat. After the meeting, he came over to thank me. That act started the ball rolling on what developed into a friendship.
Please don’t be like a former classmate who came up to me at our 25th high school reunion and admitted that he had a crush on me back then. My response was, “Why didn’t you ask me out? I would have said ‘yes’.”