for example a quote from the haunted house: a high-shouldered young fellow.
I would suggest giving the entire sentence (or more) so that we have a better context.
I think, possibly, that "high-shouldered" may mean someone who stands tall out of pride, arrogance, or genuine self confidence. But with only "a high-shouldered young fellow" to go on, it's difficult, since it is a rather uncommon gorup of words to use in reference to people.
It doesn't currently mean anything particular in the English language. A common phrase is broad shouldered which refers to an athletic build common among professional sports such as American football or boxing:
broad-shouldered — having broad shoulders; "big-shouldered and heavy-armed"
It seems likely that "high-shouldered" means something similar but the only way to know is to ask the author or writer who used the phrase what they meant.
Other potentially relevant idioms: