The one thing that you simply have to remember all the time that you are there, is that Hollywood is an oriental city. As long as you do that you might survive. If you try to equate it with anything else you'll perish.
Playing good girls in the 30s was difficult, when the fad was to play bad girls. Actually I think playing bad girls is a bore; I have always had more luck with good girl roles because they require more from an actress.
Famous people feel that they must perpetually be on the crest of the wave, not realising that it is against all the rules of life. You can't be on top all the time, it isn't natural.