What is wrong with my blatter?!?

I am a 16 year old girl I'm 5"4 and 165 lbs I am alittle over weight and it seems that my pantys are never dry and they stain. It's not wet from being horny i know when it's because of that but in a normal basis my crotch and groin area and pantys are damp they don't smell fishy they smell like salty or sweaty pee I'm self conscious about it to take my pants off in front of anyone and the salty smell makes me embarrassed also help!?