It sounds like you have either a yeast infection or BV (bacterial vaginosis). My guess is it's BV though.
Yeast infections can be cured with over
the counter medicines, but BV will not go away on it's own and will need doctor prescribed antibiotics to get rid of it.
Just head in to see your doc and he/she can take a simple sample that can test for BV, or both infections, and get you what you need to get rid of it!