Ocean
Let me change some of your answers.
Is it true? Yes, but I know it is curable. (positive thought)
How do I know it is true, Because right now I feel it is true. (acceptance)
Evidence. I don't function the way I should be able too. (fact)
Evidence against. None because I am not functioning the way I should. (acceptance)
Has it happened before. yes so it is time to change it. (determination)
What is different now. I want to be better. (Positive, not negative.)
How bad could it really be. As bad as I allow it to be.
What is the worst that could happen. It could take a while longer than I think. Doing nothing takes forever.
If the worst thing happened how bad would it really be. Bad but what have I to lose, it is already bad.
Your answers although true are not good for you because they are negative. My answers are true also but they are positive. It is okay to have negative thoughts but only believe positive ones or you will gain nothing. You have a condition, not a disease.
There are sections on assertiveness and self confidence that will help with this tendency toward negative thought. When you are negative as we all get when we think it is hopeless (ten years seems like proof) you have to become assertive with your self. "if others can do it so can I". Self confident. Spend more time on every little gain and use the set backs as only markers of how much you have gained. Set backs don't count they are in the past and the past can not be changed only learned from, it doesn't count.
Acceptance. Right now your thoughts are very negative. Accept that this is due to ten years of thinking it is hopeless. Don't fight it, change it, one little step at a time.
This is tough if it was easy there would be no need to do it would there. It does get easier.
If you think I'm being hard on you, you should meet my therapist. There were times I wanted to yell at her "you don't understand". Thing is she does and was not afraid to hurt my feelings for my own good. I only want what is best for you. I want you better, I want you free to spread your wings and soar.
Here for you
Davit.