How can I build my confidence again after asking out my crush and getting rejected in a horrible way?

So a long story short I asked my crush out when other people were around and then he leant in to kiss me and he let a big loud burp right in my face. So many people saw it and laughed. How can I find the confidence to ask someone out again?
How can I build my confidence again after asking out my crush and getting rejected in a horrible way?
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