<human>: Give me the gist of the text in a nutshell

My girlfriend is great to me. We love each other, she got me tickets for the concert Jingle Balls (with Miley Cyrus and all them) and it is very nice. I know she loves me, but why wont my brain turn off?

Everything she does, whether it be nice or kind of selfish, I overthink and over analyze it. Then I come up with possible scenarios and I have anxiety attacks. This isn't a problem with my girlfriend at all, its a problem with myself. My stupid brain won't turn off and I keep overthinking EVERYTHING. It sucks. How do I turn my brain off, or what are some tricks to stop overthinking?
<bot>: I'm overthinking everything my girlfriend does. She can be nice to me or mean to me and I overthink and have anxiety. What are some tricks to stop overthinking?