You might find it useful to read the stories and experiences of other teenagers going through the same problems as you: 

Read other teenagers' stories

The Continence Foundation of Australia have a support site for teenagers: 'Incontinence in confidence'

The National Institute for Health and Care Excellence (NICE) provides national guidance and advice to improve healthcare. You might want to look at the following documents:

Constipation in children and young people: diagnosis and management

Urinary tract infection in under 16s: diagnosis and management

Bedwetting in under 19s

Watch video for older teenagers (16 -19 years) on understanding the role of your pelvic floor and how to look after it: