Do you have an idea of your relative rank? How many and what kind of kids get into Stanford from your HS?
The fact that it was first semester of freshmen that dragged you down is a better factor. I did see something on a consultant’s website that Stanford excludes frosh grades, but in the Stanford Admissions site, they require a 4 year transcript.
Bottom line, I don’t think you are out of the running. Do you have test scores or are you going TO? So shoot your shot but have other schools on your list that you would be happy to attend that do not have single or even low 2 digit admissions rates.