Bro you are only (29) and you still have a lot of time to cover up for those past years...don't be sad bro, many of us here are going through this. Eat nice good , go to the gym , spend more time with God praying, buy a Xbox or PS and play online, kill your depression and anxiety with Ashwagandha Ksm 66 or whatever you prefer having...try different things and I'm sure things will be better. Are you going for speech therapy ? If not, then start now.  I'm not giving guaranteed medical advice here but, from my opinion. If you want to or choose to...you can even try antipsychotic medications to treat your stuttering...it's working well for alot of people. Don't give up bro.