Hi,
You might have a minor vaginal infection, such as bacterial vaginosis ("BV") or a yeast infection ~ you can research both online for an in-depth description of symptoms and treatments. They're common, and either infection can occur in women without ever being sexually active. You'll need to have this properly diagnosed by a doctor after an examination, before you can be treated for an infection. It's understandable that you might feel uneasy about talking w/ your mom about this, but I think that you'll find that your mom will probably be more understanding and helpful than you expect. Hang in there :)