Hey there, buddy. We all feel you in this stuttering thing. Q/A is probably the most common issue that stutterers like us has problem with, that feeling when you know all the answers and yet you can't speak them out unlike the others. It hurts to know that it's holding us from reaching our potential. But one thing for sure is that this is not your fault. Never blame yourself for what you couldn't control, because it is a part of you. Just hang in there, people who never experience what its like to be in our position may never understand what it feels like. That's why we all support each other here.