These would include irritability, impulsiveness, inattention, and hyperactivity. However, I have often been pleasantly surprised when the clients have reported an increase of self-esteem due to feeling more comfortable around people. In certain forms of these disorders the neurotransmitters, which are the chemicals in our brain that allow us to think and feel, are not at the right levels or proportions to each other and this can cause depression and anxiety. There is a strong hereditary component to these problems. Once a person receives the appropriate medication the typical symptoms for these disorders such as sleep and appetite problems are relieved.
Shyness also is seen a lot with people who grow up in dysfunctional families.
When growing up in these families children often don't feel good enough about themselves because they have been abandoned and feel it must be their fault. The result is a feeling of shame, not being worthy, and this is especially prevalent when in public. Often intellectually the person knows there is nothing bad about them and that the feeling of shame is irrational. However, it is hard to reduce the shame without treatment for the early family problems. I think you are probably suffering from general shyness and possibly from some shame issues from what I can glean from reading your letter.