I don't know why my right nipple is feeling itching? Plus just curious why does my breast release white little stuff from my nipples?

Breast exam. You will need to see a doctor for an exam to know exactly what is going on here. Nipple irritation can be from yeast/fungal infections or something as simple as clothing irritation. The nipple discharge could be milk or or could be a sign of infection. An exam will be the net step.
Nipple symptoms. This could be galactorrhea (small amounts of breast milk) The most likely cause at your age would be pregnancy, so check a test. Other causes include thyroid problems and increased prolactic production. Your doc can order blood work for that. The itching could be a variety of things including skin infection. Probably best to have it looked at.