How do I stop overthinking?

So I’m in love with my crush. I just have yet to ask her out. Anyways, she gonna be gone for a month. I’m just worried that she’ll lose interest in me by the time she comes back. I’m also worried that her coworkers will try to make a move on her since they always try to flirt with her. I’m just feeling like shit right now.
How do I stop overthinking?
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