Why does hair with no volume make my face look bigger and ugly?

Hey please help.i know this is a weird question but i dont know what to do. When my hair are straight i look ugly.I have to let then curly and give them volume every min with my hands.also i can take a bun:(all these are hell!!!:( why is that?is it because i have a big forehead?or is it because its wide?actually when they are wet or flat my face seems like tge top of my head misses.I dont know how to explain that..but the top is normal!my face just looks like bigger than it should be for my head

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