Looking for advice: am I ready for a 1.5k swim?

I signed up to take the swimming portion of the upcoming Santa Cruz triathlon with some buddies and stupidly started training 2 weeks ago (the race is in a week).

I’ve gotten into open water a few times for 0.6 mile swims in calm water and its been okay. I can swim 1.2 miles in a pool pretty easily with zero breaks (simulating OW).

On Tuesday I went out for a swim and it was very windy and subsequently pretty wavy/choppy out in the water. I completely failed to do my full workout and could barely muster 0.3-0.4 miles.

That broke my confidence - I am wondering if I should tell my teammates its a no-go now so that I do not put myself in danger. Anyone have advice?