Here is some great advice from Cary Schmidt who is a Baptist pastor in the US. The first three are:
1. You are of eternal value and significance because God doesn't make junk.
2. You have an amazing contribution to make to the lives of others.
3. Your only hope for real happiness is a is a real, private, personal relationship with Jesus Christ.
To find out more and read the others see the full article here.
Short and sweet inspirations for Christian teen girls.