My guess is that you come across as either a eeyore or an asshole. I do not know you and you don’t give enough information in your post, however I can’t think of any other reason you wouldn’t be hirable, unless you are unrealistic about your own skills and capabilities. If you are open to suggestions, I would recommend spending a significant amount of effort on the “how to win friends and influence people” side of the equation.

I will hire the nice optimistic less skilled engineer over the mopey, pessimistic, more experienced engineer every day of the week.