"I sometimes have moments of such despair, such despair … Bec..." — Fyodor Dostoyevsky quote meaning

I sometimes have moments of such despair, such despair … Because in those moments I start to think that I will never be capable of beginning to live a real life; because I have already begun to think that I have lost all sense of proportion, all sense of the real and the actual; because, what is more, I have cursed myself; because my nights of fantasy are followed by hideous moments of sobering! And all the time one hears the human crowd swirling and thundering around one in the whirlwind of life, one hears, one sees how people live—that they live in reality, that for them life is not something forbidden, that their lives are not scattered for the winds like dreams or visions but are forever in the process of renewal, forever young, and that no two moments in them are ever the same; while how dreary and monotonous to the point of being vulgar is timorous fantasy, the slave of shadow, of the idea...