Is it possible to become a more positive person?

I (36F) have quite a bit of anxiety, which leads me to always think of the obstacles or bad things that can happen in a given scenario, even if they're very improbable. I'd like to be less like this, to have a more positive attitude toward daily life. I don't know how, though.

Has anyone been able to become a more positive-minded person and stopped focusing on the negatives in life?