As being a teenager myself life is hard enough. You wouldn't want an STD to make it harder. Abstinence can help you avoid the extra struggle in your life and help you live a great couple years while you are still young and full of life. It is true that not all STDs show symptoms and you may live a normal life with it but that might not happen and you may be in pain for the rest of your life and always look back at what you did and regret it.