Confused about down below... Help please.?

Hi. I'm 17, I'm not sexually active in the slightest and in all honesty don't much about this area. I haven't experienced any pain, itching etc. but due to all being told that I should I sat down and looked. I noticed that on the right side, just outside my vaginal lips there was a creamy coloured substance. It wasn't in the left side and it's not causing me any problems but it's still kinda worrying. I thought it might be thrush but doesn't that cause itching? Should I go to the gp? Sorry for being completely inexperienced in this area and very naive, if anyone could help that would be great, thanks :)