I believe that God does have a plan for us, and wants us to fulfill our human potential while on this earth. The greatest difference between us and all other life forms, is our ability to 'choose.'
Throughout our days, weeks, months, and years, we get to choose our direction. You, yourself, can decide to change courses at this very moment. Of course, you cannot immediately change your situations, but you CAN absolutely change your 'direction' right now! That is a very empowering thought, isn't it?
So, you can review your life up to this point, and you can decide what areas you wish to change. Write down some of your most significant achievements and what you are already proud of, and use this list as a positive stepping stone to more goals. Then take even the smallest steps toward your new directions. Keep them fresh in your mind and reveiw daily. When something negative happens or when a roadblock comes your way, do your best to adapt and be flexible, knowing that it's not so much what happens to you, but what is most important, is the way you handle life's challenges.
If you are a person of faith, then by all means, pray to God about it, asking for his guidance. You do not have to continue in the same directions, or do the same things you did yesterday. The choices are all yours - Best Wishes!