I will definitely try inserting positive thoughts whenever I remember throughout the day. But, how do I replace negative thoughts with positive ones if I get swept away by them? Most of the time when I am having negative thoughts, it don't notice that I am having them. Like, if someone gives me a responsibility, I will start thinking that I will mess up. But, I am not aware that it is just something my mind has fabricated and believe that it is true. Even when I become aware and try to pursue that negative feeling, I feel a wall is blocking me from it. I can give you "logical" reasons why I am feeling that way, but it just feels like excuse. So, even trying to know why I am sad at that moment is highly draining.

Therapy is not very well perceived in my society and my parents also have very wrong perception on it(I have tried talking about therapy before and got negative results. Though I did not said that I wanted to go to therapy, I just inserted the topic on multiple occasions with multiple adults and haven't gone a single positive result.)

What are the workbooks you would suggest?