Donald Glover has proven the old saying that stars are really just like the rest of us. <a href='http://instagram.com/childishness' target='_blank'>On Instagram, the actor/rapper posted a series of notes</a> outlining his fears and insecurities, ranging from the idea that his parents won't live long enough to see him have children to concern his career highlights are behind him. As the following stars show, insecurity is far from a rarity in Hollywood:
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