I guess part of growing up is getting dirty, smelly and perspiring easily. Growing up is a tedious process. First, puberty and one starts eating alot. Second, you suddenly get body odour and starts being more or I should say overly self conscious. Then one decides to bathe after waking up and/or before going out. Then you start noticing all your faults, thinking others don't have all these faults and get all upset. The truth is, everyone has these problems and they are acting like they don't have and are very happy. One does not notice their problems because they don't smell that bad as they think and they are always happy. See, one does not need to worry at all unless one realised that one's friends are running away from him/her or one's friends tell him/her that they have body odour etc.

Moral: Why worry?