As a teenager, you pretty much have a mind of your own, of what and how you'd like things to be.
It is becoming more obvious that the world we live in is full of contradictions. Don't be afraid to ask questions and investigate - it will help you discern between scientific "truths" and God's Truth.
If Scripture is our standard for truth, no matter what the rest of the world thinks and says, our life and our family's values must align to it. This explains why as Christians, we will not support abortion or euthanasia.
All life is precious, including the unborn, the disabled and the elderly.