My 2 pennies - forget positive affirmation. Don't believe people that tell you that you can make it work if you change your attitude.
You sound depressed. Failing all the time will do that.
You need to explore your limits thoroughly and stay chill when you fail. Treat it as an experiment. Once you have a solid grasp of exactly what you can and cannot do, then you can start setting goals for yourself.
Experiment with every cognitive aiding technique you can find. Keep looking for new ones.
Dont worry about tasks or goals, just focus on you. You are the task, you are the goal.
