i’m 20 so we’re about the same age. you say you “don’t have a heavy stutter” which tells me you’ve still been able to live a relatively normal life. get out there and get some real world experience like a customer service job or get involved in clubs once you’re off to university. trust me, you’re going to have hundreds on hundreds of hours of practice :) i was on the same boat as you but ever since i started managing a restaurant, i’m completely fluent on a good day.