what does ''teenage tool for spurning'' mean?
For a fun-loving free spirit, this Zeerust dump I’d never heard of sounded like the arse-end of nowhere, about as far from family, friends, the ocean and modernity as I imagined possible. Perhaps I’d been a teenage tool for spurning the possible Navy deal.

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Approximately:
 Perhaps I’d been a teenage idiot for rejecting the possible Navy deal.

Tool is slang here and can have a variety of meanings and depends on context.
Spurn can mean to reject with disdain

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Thanks for your help!

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teenage fool is almost certainly the intended wording

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!