It's most likely yeast infection.

There are over the counter meds that you can get from pharmacy. Either oral or applied directly to your vagina (usually 1-time inserts more effective, or cream which is also used for other type of fungal infection).

But since this is your first time, you should get a gynae, considering you are already an adult. Get a gynae you are comfortable with and go for regular check ups and pap smears.

I can't recall the brand but you can just go to any pharmacy and ask to get the one that is for vaginal yeast infection. I think it's something like Candida+ or something. Maybe got diff brand but similar meds inside also.

From what I was told, the inserts are usually the easiest and most efficient to use. Unless it is very bad already then go see gynae.

But again, because it's your first time, it might not be yeast, so better see a doctor to get yourself diagnosed properly.