What can be the cause?

Hi this will be my second time writing in this site. I started to suffer from body odor when I was 13 years old. I could not smell it but I started to notice that my classmates are making fun of me while covering their noses. I started to conclude that i do have a body odor. I tried everything to get rid of it but the smell still exist according to their reaction. For 2 years I suffer for this curse BUT it stops when I was 15 I notice that my classmates is not scratching their noses, they didnt cover it and they can seat near me. I concluded that it was gone. But that is only for 4 years because when I was in 4th year college, I was 19 years old, the smell came back. In the bus, people are doing their best to seat away from me,they are sniffing or scratching their noses. I hate the way they stare at me just like I murdered someone. I really hate my condition and because of this I really hate my life. It slowly ruins me and my spirit. Here I am in front of the computer while looking my friends picture hanging out with other people having a healthy social life. I tried to seek a help from my parents but they think I am crazy they cant smell anything and they said I am just paranoid. Can someone please help me. WHAT COULD BE THE CAUSE OF MY BODY ODOR? It sucks that it was gone when I was 15 years old without knowing the reason. I didnt think it was my diet because I didnt change my diet. CANDIDA? I dont know I use antibiotic for one week but I didnt have bad breath and white coating in tongue. I notice that my stools are frequently soft. Here are the other possible symptoms I dont know if it could really help. I notice that I get easily tired. I gained a weight before my body odor came back (because i am skinny guy I over eat to gain weight) but now back to being skinny with belly fat which is annoying (but that is not the issue). Please help me determine the cause. I will appreciate any response. Tweet