Self-esteem is a huge issue in dealing with teenagers today. It's great that you want to try and tackle the issue with your youth department. Here are a few things to consider...

OPENING THE WORD: I'd want to make sure that your students have a firm grasp on who they are in Christ. There are some great passages to use and to make sure that your students are exposed to - like Psalm 139 and Ephesians 2:8-10. There is also some great curriculum out there that deals with the issue of helping students see who they are in Christ. Studies like the Neil Anderson material is wonderful.

MINISTRY OPPORTUNITIES: Another great opportunity to teach on the issue of self-esteem is by getting students involved in the ministry. This gives them the opportunity to express their God given giftedness and talents. Doing that shows students the worth they have in Christ and the ability they have to serve Him through their passions and giftedness.

MISSIONS: Anytime we can get students out of their comfort zone, they are confronted with the truth of God and gain a better and more accurate view of who they are in Christ. It helps them to evaluate their own lives and take steps forward to put the most important things first.

Hope that helps! Keep seeking to help students ground an accurate view of themselves in the person of Christ. They will see themselves and God more clearly.

http://www.simplyyouthministry.com/community-articles-jim-s-thoughts.html