Good luck with that.
No need to be sorry!
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Birds are pterosaurs guy rises again.
Short answer: It’s very unlikely that they aren’t.
Long answer: To start off, we can’t really be 100% certain of anything in science: We can never completely discount other possibilities. However, I’d say that the quills/bristles on this Psittacosaurus fossil are most likely a real anatomical feature. First of all, the specimen also preserves skin and scales throughout the body, which increases the likelihood of feathers (or feather-like integument) being preserved. Second of all, all of the quills are found in a row above the tail; they all connect to the tissue above the tail; and none are found elsewhere in the surrounding rock, as we would expect them to if they were, say, plant matter or random quills that settled near the body.