Im a female never had a sexual contact beforebut masturbated sometimes is there a chance i get hiv from mastrbting in my panties after public bathroom?

No: The only way to get HIV or other STD's is by contact with another persons body fluids. You do not get it from a public bathroom. Sounds like safe sex to me, if you do have sex with another person make sure you are protecting yourself with gloves, condoms or another barrier method.

No: This isn't a realistic fear. I honor your decision to forego sexual exploring with a partner, at least for now, and I often think the world would be happier if more people did the same. At the same time, you have a duty to educate yourself about what's safe and what's not ... and if the time ever comes, you'll have a full understanding. Best wishes.