[header] How to be grown up [title] Act more rationally. [step] In your youth, it's more excusable for you to behave recklessly or out of self interest. However, as you enter adulthood, a big part of your responsibility will involve thinking and acting rationally. 
[substeps] Rational thought requires you to distinguish between thinking and feeling. A rational person exercises control over his or her emotions, and acts based on thoughts instead of feelings.