What should I do with my crush?

I have a crush on one of my coworker, he is definitely out of my
league. I'm in love for the first time in my life, I never been in a relationship before which makes it harder. Im not very
attractive enough to approach him I don't know what to do. Should I forget him (but how) or make a move? I know this is a stupid question but I can't even focus on my work, he's messing with my mind!
What should I do with my crush?
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