I’m 20 and I’ve dealt with it my entire life as well but the one thing that I’ve noticed, compared to when I was 15 my stutter is still there but it has gotten infinitely better. But I’m telling you the instant you stop giving a f**k of what people think about you or your stutter, you feel so much better about life and it may even make you stutter less because the anxiety of talking isn’t there. I just know personally if someone was to say something negative about it to me, I know they’re ignorant and not a nice person and I know I wouldn’t surround myself with that person or anyone like them so why care about what they think? Just know it is probable that it’s a life long thing but there’s no reason to let it impede on your life. Live your life how you want to live it.