My life, what should I do?

The adult situation in your family is for the adults to sort out. Try to remember that you cannot make sense of what is going on. Instead, try to develop an outside activity that will allow you to work on your growth of character and happiness. You could look at a church youth group, YMCA or 4H club. You won't escape the sadness, but instead learn to become less attached to the day to day develpments. Set some goals for yourself and work towards them. Maybe redo your bedroom, volunteer at the local SPCA or enjoy all the library programs. Best to you.