One thing I always overthink is....
Could've, should've, would've
I always over thing the way I think people are perceiving me, extremely self conscious
No tengo empleo, no tengo dinero, no tengo comida, no sé qué hacer, necesito ayuda, sólo quisiera morir
I mostly overthink about the thing I believe that everyone is better than me and that I don't deserve to be loved. I also overthink about my future. I don't know to what university I will go next year and my parents make a lot of pressure about that.
My overthinking seems to be most apparent when Im in a relationship
I over think everything. It drives me mad!!!
I always overthink what other people think of me. All my actions I just replay them in my head until I'm convinced I made a fool of myself
I overthink whether or not I'm safe in a relationship (emotionally). I have a very hard time trusting, especially when it comes to love because I think that's the most vulnerable a person can be.
I rarely let my guard down, but when I do 85% of the time they let me down.
I always overthink everything and it drives me crazy! Literally. 
How to be mentally and financially stable in life. And I always thinking when that would be.