Hi,
No one online can diagnose what the small, white bumps are; you would have to be examined by a doctor for an exact answer. Keep in mind, that clogged follicles, ingrown hairs, pimples, and so on, can often appear on and around the vulva ~ the tissue is never perfectly smooth. Sometimes the bumps will go away on their own, sometimes a doctor needs to remove or drain them depending on what it is. If the bumps continue to bother you, you should have them looked at soon by a medical professional. Since you are 18 years old, you would be able to see a doctor without your parent being present, or involved. You might consider using a local health clinic in your area, for lower costs.
Good Luck