Forging ones identity in adolescence can be a challenging and difficult thing. For here you are deciding to accept the ideals of your parents or to reject them in favour of your peers or even radical ideas that you have discovered.
In this process it it easy to lose yourself. To become what you are not. To stop being true to yourself.
Sit still for a while. Feel who you are. Ask yourself what your principles are in life. Even ask what are principles.
Be kind to yourself. This is a journey that does not need to be completed today or tomorrow or even this year.
Sometimes it helps to write a journal and record your inner most thoughts and feelings. You need to take the time to explore the myriad of emotions, rules, ideas and ideals that swirl around you. Take the time to absorb what you want and reject those you don't. Try some on. See what fits.
Gradually you will settle on those that fit most comfortably with who you are.