My boss is extremely smart, and I’m associate level so I ask him a lot of questions. I feel that I don’t add much value because I’m not capable of being very independent. 

I’ve made several comments to my boss in an awkward giggly way about how i feel like i suck, sorry if i bother you too much, I feel dumb compared to you, im afraid you think im dumb etc etc. even today he told me good job on something and i said thank you haha you know me always feeling like i suck. It was like a weird social anxiety automatic reply. I Immediately regretted saying it becausr I feel like i talk like this too much. And now im afraid its going to make my boss question my abilities. 

Is it possible to get fired because of low confidence in yourself?

Im consciously going to stop down talking myself at work. But am afraid of what damage may have been done already