How To Be Like Avril Lavigne

At first buy clothes from a retail store such as Kohl's or Ardene.
Try listening to some of Avril's music. Doing such could help you attain a similar attitude to that of her own.
Avril's attitude is similar to that of a strong girl who is able to separate from the rest of the crowd and be brave as to show what she is "made of".
Why not try acquainting with others who also wish to be like Avril Lavigne? This could be a great help for both you and them.
TIPS
Some may not like your attempt at trying to be similar to Avril, and will try to put you down. Stand up for yourself, do not let this get you down.
Be brave; wear unique patterns of clothing.