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Yup your seed is now compromised.
Good news is that it’s unlikely that The Hackers(tm) actually grabbed it right this moment, so you probably have ample time to create a new seed and move all your assets to it.
This is a, shall we say, _unfortunate_ design decision on the part of MetaMask: even if you only ever intend to use Trezor as the store, MM will force you to create a hot seed anyway.
So this is the steps you should take:
1. install MetaMask
2. set up a MetaMask hot wallet, by generating a seed and writing it down just in case
3. when done, click „Connect Hardware Wallet“ and connect your Trezor
4. rename your first account to „DO NOT USE THIS“ and never use it anything, always use the Trezor account.