Usually I don't. The issue is that I so often see people who I reckon are brighter than me who fail to recognize their shortcomings or failures, that is they're not good at self-introspection or avoid doing so.
Things I'm reasonably good at are self-awareness and being aware my own limitations (if it were ever claimed that I wasn't much good at anything then no one could justifiably claim those). Being aware of them has often kept me out of trouble.