Hygiene
Why do i smell so much?
Body odour during and after puberty is caused by sweat mixing with bacteria on the skin, particularly in the armpits and groin. It is not a sign of being dirty. Washing daily, changing clothes after sweating, and using deodorant all reduce it substantially.
What this does and does not tell you
This is general information, not a diagnosis. Only a clinician can examine you, take your history and run tests. The same symptom has different causes in different people.
If something is sudden, severe, or getting worse quickly, get medical advice rather than reading on.