Are speech blocks worse than stuttering?

Are speech blocks worse than stuttering? 17M, my dad has a stutter, and i have frequent speech blocks and occasional stutters. My speech blocks are induced by anxiety most of the times, like when someone asks me to repeat myself or asks my name. Are speech blocks a part of stuttering or anxiety? Also I'm diagnosed with ADHD and OCD (Pure O). What are the best free therapy sources on YouTube for stuttering?