I have a PhD in computer engineering. I regret it.

Unless you're really into research on a particularly narrow topic for 3+ years (and not a topic of your choice, one of your advisor's choice), you don't want to do a PhD and should stay away. Take the four extra years of income instead.

On a slightly different note, every PhD I know, self included, has a story about how they almost failed out of or otherwise left graduate school if not for some serendipitous event. I have yet to meet someone who doesn't have such a story.