You feel you need to be in a relationship because you are not happy just being with yourself.  You need to start living for YOU and not for others.  You need to find things that interest you that you enjoy doing by yourself.  If there is one thing I have learned in my many years in this planet, is that people are not supposed to make you happy.  They can add something to your life, but if you are unhappy without them, you will eventually be unhappy with them.  You need to work on you ~ on becoming someone you respect and enjoy.  This doesn't mean giving up friends, but if you are dependent on them to make you active and interested in life, then you need to work on that. 

Leaving home will only make this harder.  You will then be dependent on people to help you get by, and that is how young, 17 year old girls get into trouble.  You don't have to like your parents, but they are providing you with a safe place to stay.  Use this time to get yourself help.  Talk to your guidance counselor and they may be able to get you the help you need.