I can’t speak at all and I need help

I can’t speak at all and I need help I’m 17 and i’ve been stuttering ever since I was around like 5-6 years old. My stutter has been a huge annoyance in my life for as long as I can remember, it gets to the point where I can’t even speak it’s like i’m out of air and no words will leave my mouth, but the second i’m alone I can speak fluently. I’ve found ways to avoid my stutter like avoiding words I know I have trouble saying or just trying to shorten my sentences as much as possible but this only gets me so far. I’d really appreciate some advice from anyone really, I’m going to college next year and it would really suck trying to make connections while barely being able to form a coherent sentence.