I just try to use English and to make it clear.
A:Although 高强 is shy and introverted,I am afraid that he would be too sad to control himself well,and even do something to hurt himself.
B:( 乌鸦嘴,this is hard to translate.but i think "bite your tongue" is appropriate.)Bite your tongue,he will never do that!
C:your father earns ao much money(abiviouly his family is so rich),of course you will never have the same feeling or do such thing.(maybe C needn't worry about money,but 高强 worrys too much)
D::要是陆涛对我不好,我就至于!听到了吗? 陆涛?
if 陆涛 did not good to me,I would do such thing(get into such condition may be as 高强)。You got it?陆涛?