And you can read from all the comments on this page [2] that this isn't an isolated occurrence: lots of people are really worried about smelling like poop. And while we've learned from other commentors that changing your diet [3] can make a big difference, that's not what I want to discuss.
Instead, here's the question: you suspect that you may smell like shit. You don't have a best friend you can trust, and you don't believe your parents would tell you the truth. How could you find out for sure? Maybe the answer "go to a doctor" is too
obvious. But I'm sure there are many more creative and entertaining proposals.