Thank you for your answer and it made me feel a little better.
And sorry for my late reply.
So the butterflies in my stomach only means that I have strong feelings for him, but I've never had this feeling before, even to my ex boyfriends. Was that beacuse I didn't like them much? I used to have relationships with guys I felt comfortable with from the start, but they all didn't work out. None of them was my type.
I can't help but look at him when he's around, and he looks back at me too. And after we looked at each other once he sat close to me, but I couldn't say anything to him(he didn't say anything to me either). Should I talk to him the next time something similar happens, or should I first talk to other people to let him know how I talk to people and feel closer to me? I have some general questions for him that I could ask anyone at my work, so if I have a chance I'm going to ask him one or two of these questions to see how he will react.
I think it's better not to show my feelings about him for the time being. But when can I show them to him?
It may be that you feel very strongly about this guy and that is why you feel nervous about being around him. You may not have felt the same about your other relationships. You could say something to him next time you see him, just something brief like hello, how are you? Just to open communication between you. That way, he knows that you have positive feelings towards him. Then wait to see what he does before you ask him any questions. You want to be sure he is open to talking with you, which is sounds like he is. Wait until you have become friends before showing your feelings. If you do it too early, you could scare him away. Once you have a good rapport and know each other a bit better, then you can let him know how you feel.