How to approach a Cancer man?

I'm in love with a 22 year old Cancer. He seems so beautiful to me outside and inside,and I think I could love him, which I thought will never strike me. This is one of those moments in life when,if you don't do something,you'll regret forever. I see him almost everyday in a student restaurant. How can I meet him? I get terrified when I think about approaching him,'cos he seems so reserved and shy so I'm afraid I'll be rejected and he will later think how did I dare disturbing him. I'm 21 year old Leo.