Occasional impulses to do something dangerous are relatively normal and are typically indicative of temporarily low dopamine levels. Thrill seeking and novelty seeking behaviors as a personality trait are also linked to dopamine; although they are likely moderated by several genes, a known abnormality the 512C/T gene, which codes for the D4 dopamine receptor, is present in a statistically significant number of individuals exhibiting novelty seeking behaviors over a long period of time.
It's not you, your brain is broken.
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