Order free samples so you can try them all (don’t try them at school or work because it would be better to leak at home than in public. )
If you are unable to change it and you have a heavy flow either use both a pad and a tampon, or use a pad and two pairs of underwear. It is better to wear a pad and then wear some shorts and a pair of loose trousers for comfort and reassurance. If you have an event where you have to wear a dress, wear spandex yoga/workout/bike shorts under the dress to prevent an unwanted accident.
If you are self-conscious about changing, go in the bathroom, in a private corner or wear a long t-shirt. Remember to check yourself regularly.
Keep a little bit of chocolate with you; when you’re feeling down, chocolate may help you feel better. Maybe even have a chocolate coated strawberries as a snack!
Wear perfume if you like it. Wear a bit of perfume or scented body spray to help you feel nice and fresh. Limit the amount of makeup you wear; it’s best to feel fresh and confident.