"Old age"... You're 25! I guess that makes me (late 30s) decrepit, lol. This seems like a very drastic change. I commend you wanting to work on your stutter. I am almost 40 and have mostly been ignoring mine for years - just started speech therapy for the first time in 20+ years - but I didn't quit my job to go to therapy. I would try to untangle the various things going on in your life - disliking your CS degree, your speech, etc - and would recommend you talk to a therapist (not a speech therapist, a "regular" therapist) before you make any big decisions.