Wow lines around your mouth at 15. That's kind of young to have them. You can probably use any over the counter wrinkle cream that has alpha hydroxy acids, coenzymes Q10 or kinetin in them. You can also try doing some face tightening exercises 10-15 minutes a day (you can look some up online) I'm a big believer in using coconut oil whenever possible. It's such a natural antioxidant and moisturizer. You can also add vitamin E into the coconut oil.
Remember to always use an SPF even on cloudy days to help prevent future wrinkles.