I like a guy but we can never be together, how can I move on?

I like my coworker however he is 21 and i am 25 so already we are on different maturity levels. He also is not attracted to me, and we have a new girl who everyone thinks will look cute with him and although they won’t ever date because of religious differences i still find myself jealous. But most importantly i can never be with him as he is like a younger brother basically… i need to move on but i can’t control my feelings at all. Please help me👀
I like a guy but we can never be together, how can I move on?
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