Is being 14 and being 12 stone bad?

Being 14 years old and weighing 12 stone is not bad, but it is quite overweight. The average weight for a 14 year old girl is 7.5 stone and for a boy it is 8 stone. You might be best to make an appointment with a dietitian who can help you work out a healthy eating plan and exercise routine so that you can work on losing the excess weight.