The characters in this are a bit over the top, but OOF if I didn't feel Ch1Pg8 and Ch3Pg2.
Futami's focus on sexual scenarios is a bit ... odd, and the way she hid behind her editor in the third chapter isn't very realistic, but I could see a lot of the rest happening as someone's internal dialog pretty easily. Blowing up little lapses into signs that you're terrible or agonizing over your behavior, to the point where you actively make things worse for your self, are both fairly common experiences, especially for people with certain conditions, like ADD.