Hair style changes will not affect people's overall impression of you, but will affect your mentality, thus affecting your attitude, that is, lower self-confidence. In fact, there is absolutely no need to attribute this to the change of your hairstyle.
Self-confidence can be formed and changed through appearance. But self-confidence can also be changed through inner shaping. The most powerful person is not his appearance, but his heart. Look at the stars in the entertainment circle. They are ugly and beautiful. Some people are ugly, while others are full of confidence.
You can completely abandon the influence of hair style changes on self-confidence and support self-confidence with your heart. In this way, you can gain really strong self-confidence.
In fact, you care too much about the influence of appearance on yourself, and then you care about other people's comments, and then you are obsessed with it. Do not believe you, from today on, look at yourself in the mirror for three minutes every day, and tell yourself with firm faith that I am 25 years old now. In a few days, you will return to the 25-year-old mentality. At that time, you will feel that confidence really has nothing to do with hair style.
As for performance, just do it with your heart. The poor performance these days just coincides with the low tide, which really has nothing to do with your hairstyle.