God this reads like something I would've posted at 16. Yes, stuttering is often embarrassing, and humiliating, and makes you an easy target, and yes it's an awful feeling. I don't really know what to say other than that you're not alone. As far as whether it's too late to "fix" your stutter, I'd say your stutter is most likely going to stay with you into adulthood, however, there are measures you can take to mitigate it such as working with the American Institute for Stuttering.