OCD is making me a creep

I ruminate on things until I feel like I have to act on them. there's this girl at my job who i off and on think hates me or wants to get to know me. I always go too far. either ignoring her completely (thinking this is what she wants) or after a good interaction with her, I'll overstep. Talk to her too often. Try to give her little gifts ( I brought her and a few other people cookies for Christmas). Yes I am very attracted to her but i would like to be her friend but i always fuck up. And when I think I've really fucked up, my mind goes in circles for days until I feel like I have to confess what I've done. I've done it a few times. And it's clear every time that this great injustice I committed is only in my head. I feel crazy. sometimes it seems like some of my coworkers are mad at me for being so thirsty for this girl. I wish people said exactly what they're thinking so I feel less insane. Is this all in my head? Have I fucked up, or am I convincing myself that I'm a bad person again? I'm already resolved to not look at her tomorrow.