Actual high school sophomore here- At this point in the school year I'm getting good at it (So good they're upgrading me to a junior next year), so I have some authority to speak on this.
My freshman year of xc I started out embarrassingly slowly having not run more than I did in soccer practice since the 5th grade gym mile. I won't tell you how slow I was at the beginning, but at the end of the season I won "Most Improved" with a 20:20 PB.
2 1/2 months later I beat our xc captain in a mile where we both had about 20 minutes after the 4x8 (I was subbing in for someone who was sick), qualifying myself for our regional competition (I got the last spot. He was pissed.) I went on to run a 5:09 PB that season.
In outdoor I though I was going to run a 4:45. Instead, I got a change of coaches (good to bad), ran 3 1/10s of a second slower than I did indoors and lost a month of my season to a knee injury. I also ran 11:04 and 2:14.
In the summer I was determined to become good for xc. I'll spare you most of the gory details, but I injured myself, and subsequently tried aqua running at the beach-stepped on a sharp rock. Missed about two weeks, came back to town and it was 95-105 with about 80% humidity. Did not do a lot of running. Overall I got about 250 miles for a 10 week summer.
In the XC season I was solidly on varsity with mid to low 18s times. At our state qualifying race I had a mini breakthrough and ran just under 17:50 for 5000m to be our number 2 guy. We missed states, but so did our rivals (Schadenfreude, as they say).
This year in indoor things were dreary. I was under the terrible coach from outdoor, and I had cold that lasted for weeks. Ran 5:04.
Now in outdoor I have made a strong commitment to solve my own problems and train on my own outside of practice, and have run 4:50, 2:12.
The point is- you can run ok even with sucky coaching, injuries, and few team mates to push you. So relax, have fun, scald dogs occasionally, and become a legend in your own time.