My back looks slightly curved?

Hey I'm turning 15 soon and I am female, anyway lets get to the point, my parents say I'm a hypercondriac because I freak out about the smallest things till the point I'm paranoid. I have a habit of googling symptons too. Anyway a few months ago I never really noticed it before and don't know how long it's been this way but one rib sticks out further then the other so I started googling and found out about scoliosis. I started to panic and felt my back but it felt straight so I calmed down a bit. Today I was abouts to enter the shower and I checked my back from behind, It looked like it was curved. I started feeling scared and sick so after my shower I told my parent I was concearned about it and to check it. Both parents had a look and thought it was fairly straight, and didn't notice much wrong, my dad said a shoulder wing was sticking out a bit further then the other but that was it. I showed my parents a website on scoliosis and they said they would book me into doctors after christmas. They said I shouldn't worry but I'm terrified of what it could be, they don't seem to notice the slight curve but I can and it's driving me insane I have a strange pain in my back as I type this but I think that's just something from my head and not really there. Anyway what do you think this sounds like? Am I just being my usual paranoid self, or is there something wrong? And if there is something wrong is there anything I can do to help it?Just to say, my shoulders are level there's no sloping, and my posture isn't that bad like I don't hunch over or anything but when I was very young me and my sister were messing around and I fell backwards and landed with quite a force with my back into the edge of the sofa, could this play a part? Thanks so much for help :)