Same. That feeling of I have so much to say but I'm failing in communicating by not being able to, and therefore often being misinterpreted or even mistrusted, or seen as a shallow person as sometimes you prefer silence to miscommunicate something. It's a horrible feeling. And because of that, I felt voiceless for so long (since a young age). What helped me a lot to decompress this feeling as I grew up was reading and writing. The writing was a refuge because at least in writing I can be free and there are no boundaries. I found new words that eventually improve my vocabulary to discover alternative words that I was able to speak properly. Even nowadays it's a continuous practice and still helps me.