I am scared to send friend request to my crush. What should I do?

I met a guy about 4 months ago and really liked him. I found his facebook account and I have stalked him ever since. I feel terrible. I know he's single through his facebook and I really want to make friend with him. But I don't have any mutual friends with him, is that too weird to send a friend request? And if I send it, he will know that I tracked him (and he will know about my purpose when making friend with him). Well we haven't seen each other since that first time, but I was like "love him at first sight" (not sure about "love" thing). And he didn't feel the same way, I think. I was dreaming, thinking about him and "our future" ( I am crazy, I know). I am really scared that he is gonna meet someone, love her, and that makes me sad because I can't have what I want. I think I am obsessed and a coward. What should I do?
I am scared to send friend request to my crush. What should I do?
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