I suspect that you have yet to come across this aspect of more advanced grammar.
Have a look here -- I think it will explain all for you.
Avant que + ne explétif + Le Subjonctif = Before I do
Hope it helps.
Jim is correct: this is a case of the ne-explétif, an advanced grammatical concept. It is not a negation because the second part of it is lacking (usually pas, jamais, plus, personne, etc.). Instead, it is used as a stylistic element, mandatory in higher level French and often dropped in colloquial French. You'll get to it in time.
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