Reading reading reading

Im doing really well.
I have been reading about all sorts over the last few days. Psychology, sleep, dreams, exercise, nutrition and much much more.
I need to get my life back. Its been a blur so far. Everything has been out of focus, nothing has made sense. I have had no control over my thoughts and my thoughts have let my life get out of control.
Over the last ten years I have made attempts to eat better, exercise more, return to education, meditate more and generally pay more attention and make more of an effort to improve myself.
It goes well for a day, a week a month and then it stops. I never see anything through. I never make anything last. I have been sabotaging my own life for many years now.
Enough is enough. I have a long time left on this planet and I cannot go on living like this anymore. Everything is coming together and I am going to make sure it stays together. I am going to build a solid foundation for myself to grow and have a happy life. 
I need to set a goal but I am not sure what to goal to set?!
Maybe fitness would be good. Healthy body healthy mind and all that jazz.