HELP LADIES!!!

I know what normal vaginal fluid is.

A few weeks ago I noticed it getting thicker and thicker and now recently it's green.

I've never had sex or any thing as such, so STD is out of question. I'm too nervous and ashamed to go to a gynecologist..

I'm 21 years old. What do you think is wrong with me? And If I go to a doctor what is the check up like?

Has any one had the same experience?