You can get over it.

I suffered the same stupid inhibitions for a long time, as part of a pattern of generalised social anxiety. One day I just got lucky, met a really nice person doing random content in WoW, and I forced myself to join in chat with him and his party when they invited me.

They were cool and understanding about me being quiet. Eventually with that acceptance I started to feel comfortable. Over the next weeks or months even, it just started to feel natural to chat, first with my friend, and then eventually with strangers. I would still get excited and say stupid stuff or fall over my words, or just gargle like an anime character, but I could tell it wasn't the same as the crushing fear I felt before.

Eventually video games became a refuge, somewhere I didn't have to feel the anxiety I felt in the rest of my life. That was and has been a huge help for me. These days I'm even a very confident person online; but there was a time I couldn't even post a message on reddit or whatever without having a panic attack about it.

Short version: be patient with yourself. Be like a good friend to yourself. Give yourself a break. Eventually if you hang in there you will turn it around. x