I am a young slim female, with disproportionately big and heavy arm and shoulder muscles. I DON'T EXERCISE AND NEVER DID. The visual effect is embarrassing and masculine, it has caused me to have a permanent slouch and I can't bear to sit upright for more than several minutes. I used to think this was due to fat tissue and breast size, lost extreme amounts of weight to relieve the back pain and the comical appearance, problem still persists, muscles are even more visible and toned now. Help?