Of course your family has a huge impact on your attitude. Family is typically the greatest influence in most of our lives. Nevertheless, your heath is something you can do solely for yourself, and completely independent of anyone else around you.
That said, you need to state your goal and give a time limit. You can't start a journey unless you first determine your destination. Otherwise its just wanderlust, and how can you know when you've reached your destination if you haven't first determined where you're going?