How much does appearance matter?

So I want to approach a girl I'm crushing on (never spoken, but I know she has noticed me) and just want to know how much appearance matters, I'm genuinely well dressed and consider myself OK looking but I find her very cute and am worried she is out of my league, how can I tell if she will be attracted to me? And should I approach?
+1 y
By OK looking I'm 5"7 and very skinny but with defined muscles.
How much does appearance matter?
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