Yea same happening to me in uni,I just learned to accept it and do my beat to improve it,whatever results come or not.This made me mentally state much better In my case alot of people didn't give a crap about me whatever I stammer or not most people will still ignore me even if i speak clearly so i would be still lonely xD ,just be yourself and when you are yourself try to feel the flow and manage it (don't control or force it) A speech therapy and self positive can help alot,also have book or side hobby to take the lonely time away and even if is there is nothing to do,just enjoy the nature.The world is much bigger than what you are facing