Have you heard of summit fever? It's the feeling that sets in when you are getting close to accomplishing a big objective but are not quite there yet, the anxiety that you must get to the top no matter what. It's a huge factor that can lead people to make poor decisions, because the urge to complete a hike/climb overwhelms our otherwise sound judgement. Sometimes you can get away with pushing the boundaries of comfort and safety, but other times the boundaries push back.
I used to struggle with turning around and occasionally I still do. Turning back can feel really bad, like you failed, you weren't physically fit enough, or you made some poor planning decisions... But let me tell you something: it's okay to turn around. In fact, it's the number one sign of a smart outdoors person.
I like to think about every hike as a game of jenga I am playing with the outdoors. Every time I make a poor decision, I have to remove a piece. Small mistakes, such as leaving an extra layer at home or not bringing enough water, result in me remove a single piece. Bigger mistakes, such as getting started late or not doing thorough research, result in me removing several pieces. The goal is to get back to the trailhead before the whole thing comes tumbling down.
Evaluate your situation using your past experiences, judgement, and common sense. If you decide your jenda tower is stacked against you then head home. No need to make excuses. You are making the smart choice.