Thanks for your replying. I am confused whether my friend really can't smell me or they just want to let me relaxed. now, i exercise everyday, and I'm on a diet. i hope things will change. besides these symptoms, in summer, my skin can be easily filled with fat(oil), especially on my face and on my hair. I have to wash my hair everyday. on summer morning, sometimes,the moment i wake up, i can smell a acid smell. i was thinking if my endocrine system goes wrong leading my fat metabolism abnormality. it may be. so we try to have a healthy way of life, low stress, time will save us. i believe.