Marred by obvious suppressions.

In consequence, I'm inclined to reserve all judgments, a habit that has opened up many curious natures to me and also made me the victim of not a few veteran bores. The abnormal mind is quick to detect and attach itself to this quality when it appears in a normal person, and so it came about that in college I was unjustly accused of being a politician, because I was privy to the secret griefs of wild, unknown men.Most of the confidences were unsought-frequently I have feigned sleep, preoccupation, or a hostile levity when I realized by some unmistakable sign that an intimate revelation was quivering on the horizon; for the intimate revelations of young men, or at least the terms in which they express them, are usually plagiaristic and marred by obvious suppressions.

Source: The Great Gatsby http://www.publicbookshelf.com/ficti...er-vulnerable

Hello my friends,

I know the meanings of each word in the blue written part but I can't understand it as a whole.
Would you please be nice enough to paraphrase it to me?

Many thanks.