If your school doesn’t have a uniform rule, then wear whatever you want as long as you stay within the dress code. Have a variety of clothing: basics, such as jeans, solid colored t-shirts, and solid jackets. That should make up about 70% of your closet. The other 30% can be weekend t-shirts, splattered/color jeans or trousers, and favorite jackets. If you’re not familiar with the dress code, most of the time it’s two finger spacing for tank tops, shorts can’t be more than three inches above the knee, and the neckline of your shirt has to be three inches from the base of your neck. Wear something that the dress code will allow, and try to look as nice as possible. You want to make a good first impression, so dress to impress.
Ponytail, French/Dutch/Fishtail/Infinity braid, pigtails, half up-do, side braid or a bun.
A good way to become confident is by practicing. A good way to practice is by standing in front of a mirror. Look yourself in the eyes, read out a passage that motivates you. Relax and try to gesticulate as much as you can. If you do this enough, you will start to do it around other people too. Averting your eyes and not looking directly at the person is taken as shy and definitely not confident.
Make time to think about the day, what interested you and what could have been better. Write certain observations and develop a thought process for good and bad events in life.