need some help

need some help i’m 15, and for a few years now, i’ve have a minor stutter, or tick. it doesn’t completely affect my speech, but sometimes i find myself repeating words over and over, trying to get them right, or having trouble starting a sentence. when i’m on my own, it happens a lot more. it seems that whenever my brain isn’t occupied with something like talking or playing a game, i start doing things like bite my teeth in certain places and repeating words. is this something that will just go away, or am i stuck with this for my life, because it never used to happen