I think both! I had that same as you... well for me I had it bad as a child but at around aged 14 it was not too bad, but at sged 20 it got worse when i was told i needed to do a presentation at university. i used to avoid situations where I would have to speak, or change wordsz or avoid using th3 phone. like I would ride my bike for 20 minutes to make a hair dresser appointment rather than call on the phone. maybe you do things like that to appear like a non stammerer, maybe not! I met people who you wouldn't guess they stammer but they attended the course because they were tiree of hiding it.