Hi Mulan,
I don't want to dismiss your concerns. They are real and connected to your experience and knowledge, but, what is normal, if not a concept socially constructed? I know, I know all the stuff you said. And that is important. But, please, also consider this:
- going out of the Internet Psy sites (like this one, for example) dominated by Anglo psychiatry. Look in books for other schools, such as socio-critical authors talking about madness. Foucault for example. Get in touch with other paradigms
- not forgetting that madness (or behavioral disfunctionality, or whatever) is a concept related to history and geography. It is a construct. What is considered crazy now and here perhaps it was not considered as something crazy in the past. Right now if you move from a very community driven culture or a culture where people externalize much their feelings to another one that is the opposite, you will be called crazy or at least inappropriate. The same works for the contrary. I saw it myself: kids raised in a foreign country. Teachers and others said the kid was "weird" while he was only behaving like people from his Culture.
- seeing how politics and other factors are playing a role as well. 20 years ago in bibliography homosexuality was considered a disorder. Transexuality was considered gender disphoria (actually some professionals still consider it disphoria) etc. Today, they are not disorders. So, in Psychiatry many things are too much dependent on many other things than can change with the time, for example.

Of course, you want to change things in you because you want to be happier and that is legitimate. And you want to know if this change is possible.
But, what "normal" are we talking about here?
A normal that is a social construct to me. I really don't think that "no normal" (or disfunctional) can be classified like we classify diabetes, for example, or "treated" like we treat diabetes, for instance.
Hope you have the opportunity to experience a paradigm shift about "mental health".
Sorry for the long statement. I wish you the best