I'm crying rn feeling so left out

I def married into the wrong family. No matter how much my husband tells me that we're right for each other, it's just when I'm around his family I stick like a sore thumb. I'm extremely, shy, socially anxious, isolated and awkward, whereas my husband's family is always one of the most (if not the most) extroverted family at the party that's shouting, laughing out loud, and having a great time, while I'm always looking for places to hide away at parties, trying to avoid making my husband look bad that he's married to someone who can't even fend for themselves in social settings.

What should I do? I'm tired of the same advice: you just have to build your confidence and speak up, just be open with your family about your situation, or set clear boundaries. I'm juat tired of dealing with this, my confidence sweeps the ground with each party