everyones labia and female parts all look different.. the lump you see with the hold in it, is probably your urethra (pee hole).. i dont think you should be worried over this
Why do you think a doctor would examine your genitals in order for you to play high school volleyball? He'd probably just examine your heart and lungs.
Google betty dodson, or even Wikipedia, and look for stuff on normal labia. They all look unusual and every one of them is normal.
If you don't want to go to your regular doctor because you would die of embarrassment, go to Planned Parenthood and get a pelvic exam. Lay it onto the line with the gynecologist and ask if there is anything wrong with your clitoris.
Good luck!