Is this irritation or STD?

i have just recently deployed. And when you come to iraq you have to drink lots of water so i pee alot and the toilet paper is not Charmin. But i have noticed that i am like a little raw down there, and i am a bit of a hypochondriac, but has anyone experienced this? or do i need to go to dr? i have no other symptoms of STD at all i mean not discharge nothing, just when i pee it feels like i have like little chapped like when you have chapped lips... dry? HELP ME LADIES!