Your transaction will confirm eventually. If it doesn't confirm within a few days, it could potentially be 'returned' to your wallet as if it was never spent. If someone is actively rebroadcasting it, and they cannot be stopped, it will remain in the mempool until some miner picks it up.

All in all, you won't lose the Bitcoins and it would confirm eventually (albeit after the mempool clears up which could take some time).