to burp or not to burp?

My baby girl is 9 days old and I'm exclusively breastfeeding.... I give her one boob and burp her but when I give her the second she always falls asleep afterwards 
I was waking her to burp her but then find it so hard for her to fall back asleep ... and she's cries because she's clearly tired
I've tried letting her cry it out and music but usually takes 20-30 minutes to get her to go down. So.... I've stopped burping her after the second boob. Am I a terrible mommy out of laziness? Just can't take her crying 
She usually doesn't burp anyways... seeking advice 

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