I'm not too sure what you'd be, maybe a top because usually the lighter person goes on top and I don't think you're very heavy.
For me, I'd say bottom because I haven't had the best experience with being on the top bunk, mainly because of my height. There had been many times when I'd woken up and immediately hit my head on the ceiling, as well as falling off the ladder sometimes. (I don't have a bunk bed, but I've been to places that do.)
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