I'm still in my youth years (teenager) and I've been experiencing stutter since I was 5 years old. I've sorta come to terms and acceptance with my stutter but a lot like you, I get frustrated and maybe you could say angry when seeing or hearing people just speaking fluently and engaging in social activities and chats. But it's not worth looking down on yourself or hating you for having a stutter. I haven't experienced life yet but I'm not going to let my stutter be a fat chain holding me back. Although I mostly stutter with my pears and not with friends and sometimes in public mostly. I might sound like a secure person but don't mistake me, I still sort of cry inside and feel anxiety:/ But you're gold man, no you don't have a value because you are who you are and that's what's make you so special and fantastic. Just letting your feelings and thoughts out on a online forum is brave as hell. I feel you... but life is too short to have second thoughts. Good luck man!