Yes, there is a term for thinking about something until it happens or believing that thinking about it strongly can influence its occurrence. This concept is often referred to as "manifestation" or "the law of attraction."
Manifestation is the belief that positive or negative thoughts can bring about corresponding positive or negative experiences in a person's life. According to this belief, focusing on a specific desire or outcome and maintaining a positive attitude can attract the desired outcome into reality.
The idea of manifestation has been popularized in various self-help and spiritual circles, where proponents suggest that by visualizing and affirming one's goals and desires, they can bring those desires into existence through the power of their thoughts and intentions.
It's essential to note that the concept of manifestation is subjective and not scientifically proven. While positive thinking and goal-setting can have a beneficial impact on a person's mindset and motivation, the idea of "manifesting" specific outcomes through thought alone remains a matter of personal belief and interpretation.