Do you realize that just because you may have been stuck in a negative, destructive thought pattern, that does not mean they have to hold you hostage? Why? You are free to let them go at any moment.
Understand that your mind is a powerful tool that life has given you to think however you wish. When you put all your thoughts to use in a positive, meaningful way, you will see a difference it can make.
Beginning today, you are responsible for the thoughts you have. When you know that you do not have to think, then you are free to think whatever you choose. Begin to have the thoughts that fulfill you.