Personal? Clueless?

Why do people make the decisions they do? Why do they think even dangerous things that can affect us further in careers are good for the time being? I just want to know the reason, is it to fit in? or is it out of frustration to just get it off their chest? ; even though the answer depends on the situation I would like to get in someones mind for a day and see what their reason is. In Identical by Ellen Hopkins Raeanne makes the decisions she does

because she faces lot of stress and she basically has no other way to escape the stress. Her way of relieving herself is not the best but it seems like her body takes over her mind and makes the decisions.

Raeanne relieves her stress by smoking with her friends , partying and having sex , their not the best things to do when your a teenager but once again its like her body is controlling her and shes not head over toes about it. Her conflicts in life are steering her in the wrong direction but at the same time she thinks what shes doing is right for her which is sort of a win/win situation because shes living her life but at the same time its not really benefiting her because shes harming her body.

Sometimes when I get in stressful situations and I start to build anger I try to just shake it off and try to resolve it without violence because its definitely not the answer, others might think they know whats good for them but sometimes a helping hand could help to steer in the right direction. I'm not Raeanne and i'm not trying to change her but theres other ways to get out of situations when things even seem bleak , I think she should maybe see a counselor that would definitely be a good mentor. It could solve her stress and also how she takes care of those issues.