Click tracks work for some situations and not for others, like folks here said.

The first time I went in to the studio to do a promo, I naively prepared the rhythm guitar part without a click track, not having ever done any one step at a time multi-track recording.
I had the part nailed, but the click track screwed me up. I actually asked if there was something wrong with the computer. The engineer, who's a good friend of mine now, almost busted a gut laughing.
Anyway, it prompted me to make a study of tempo -- not just playing to click tracks, but listening to recordings, illegally playing a shaker to music in the car, walking in rhythm, so to speak, learning a little drums....

Now I can play with click tracks if need be, and my tempo skills are light years better when there isn't one around. I listen better, all those good things.

You can learn to play expressively with a click track or metronome. Once you do, your understanding of groove will surprise you.

On the practical side, if you think the click track makes your playing flat -- play a scratch take to the click track and then play the keeper track to the scratch track. It might be easier to be "expressive," but in time with another guitar backing you.